What Size Tank do Goldfish Need?

Goldfish Tank Size

So you’ve learned that goldfish cannot live in bowls and have to have a tank to be happy and live out their full lifespan. After all, they DO get bored and actually have a much longer memory than what most people assume.

The question arises: what size of tank do goldfish need?  Glass aquariums come in many shapes and sizes, and it can get overwhelming trying to figure out which one would be best for you and especially your fish.  Here is a helpful guide to selecting which tank size you should get.

The Secrets to a Healthy Goldfish Revealed

Learn how to keep your goldfish alive and thriving using the only complete, accurate goldfish manual available today –
The Truth About Goldfish.

Tell Me More!

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Do Goldfish Need a Big Tank?

Yes, absolutely!  Goldfish can’t live a normal life in small containers – they need their elbow room, too!  Just as a person wouldn’t do well cramped up in a tiny closet their entire life, a goldfish won’t either.  Most people are surprised when they learn for the first time how big goldfish can get.  Fancy goldfish (the kind with the split or “double tail”) can easily reach 6 to 8 inches in length. INCHES.

Single tail varieties (such as the common, comet, shubunkin and wakin) will more than double that, which is why those kinds do best in a tank size of over 100 gallons or, ideally, a pond.  If you want to promote healthy goldfish growth, your fish will need some space.  You cannot have a tank that is too big when it comes to goldfish keeping.  The bigger, the better… especially from your fish’s perspective.

Contrary to popular belief, larger tanks are actually less work than smaller tanks.  You see, the water in a small tank gets dirty much faster than the water in a big tank, which means that you will need to do more frequent water changes with a small tank.  Goldfish are constantly producing a toxin called ammonia, which is very dangerous in small amounts and deadly in larger amounts.

Doing water changes is the only way to keep your tank from getting polluted, and water changes comprise the majority of the “grunt work” when it comes to goldfish keeping, as you will quickly discover if you haven’t already.  So please don’t be intimidated by the thought of having a larger tank, if you are used to small ones.  Your fish will thank you for it.

The Golden Goldfish Rule

For fancy goldfish, the general stocking rule of thumb is 20 gallons for the first fish, then 10 gallons for each additional fish. Single-tailed fish need far more room, and at least 40 gallons per fish is mandatory (a pond would be best).

Many of you reading this may not be following this rule.  I certainly didn’t, when I was first learning how to keep goldfish.  As a goldfish enthusiast, I wanted almost every goldfish I saw, and bought almost every goldfish I wanted, and ended up owning 8 fancies at once.  This resulted in disaster for my 10 gallon aquarium.  I couldn’t keep the ammonia under control and could never do enough water changes to keep up with the waste load that was being placed on my filter.  Worst of all, my fish were constantly sick and dying off.  But because I (selfishly) loved goldfish so much, I didn’t want to cut down my collecting habits to accommodate my tank size.  I had to learn my lesson the hard way when I lost ALL of my goldfish one by one until none were left, which was unfair to them and stressful and depressing for me.  Please, don’t make the same mistakes I did!  I know that sounds dramatic, but it really is a life or death issue for your fish.

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Do things right the first time and follow The Golden Goldfish Rule.

If you aren’t following the stocking rule, start.  Spend the money and get a larger tank for your fish if they are overstocked.  If you can’t afford it or don’t have room for a larger tank, consider taking back some of your fish or give them to someone who has the space.  Sometimes you have to make a tough decision for the greater good of the collection.

*Sigh* the great matters we have to weigh as goldfish owners.

Some Helpful Stocking Tips:

  • Decide how many goldfish you want to own BEFORE you buy the tank. This will prevent you from being stuck with an undersized tank when you want to expand your collection.
  • If money is an issue when it comes to picking out a tank, try looking at garage sales or secondhand stores and get an aquarium used. This can help you save quite a bit and you can usually find a decently working tank that more often than not comes with equipment and accessories.
  • Stick to the plan.  Once you have purchased your tank, don’t go crazy buying goldfish left and right.  Don’t keep adding fish when your tank is totally full according to The Golden Goldfish Rule.  If you just have to get more goldfish, upgrade your tank size along with them.
  • Here’s the best tip yet: buy the biggest tank you can afford!  Really, I mean it!  Save up, ask for a raise, mow lawns, do what you need to do to get a good size tank.  If you are crazy about goldfish, you will want a big family.

There you have it, folks.  Remember that your goldfish will thank you for giving them enough room and will reward you by growing big and strong and healthy.

Best of all, you will not be stressed out worrying about why your fish are always sick or fighting.  You are actually doing yourself a favor when you do them the favor of getting them a big home.

I’d like to hear your thoughts on goldfish tank size!  Feel free to leave YOUR comment below.

And you really should check out our new book, The Truth About Goldfish. It contains everything you will ever need to know about goldfish keeping and more to make sure your fish stay healthy and thriving.

It’s the labor of over 10 years of research and experience and a sure-fire way to make sure you do things right the first time (who wants to learn the hard way, right?!).

The Secrets to a Healthy Goldfish Revealed

Learn how to keep your goldfish alive and thriving using the only complete, accurate goldfish manual available today –
The Truth About Goldfish.

Tell Me More!

4.5 90% from 62 ratings
Rating 4.5 90%

4.5 90% from 62 ratings
Rating 4.5 90%


  1. Samuel Funtila May 8, 2015 at 4:37 pm - Reply

    I have 10 very small goldfish with a 30 gallon tank is my tank too small for my goldfish pls help me I’m a beginner

    • Pure Goldfish May 31, 2015 at 1:19 am - Reply

      Yes, 10 goldfish should have a tank of at least 100 gallons or more. 3 goldfish is pushing it for a 30 gallon…

      • mart September 6, 2015 at 2:55 am - Reply

        Is it OK a 10 gallon tank for 2 goldfish

        • Pure Goldfish September 6, 2015 at 3:07 am - Reply

          Hey mart! No, 2 goldfish (the fancy kind) need at least 20 gallons.

  2. Sooz Smith June 18, 2015 at 6:01 pm - Reply

    I can’t believe you said putting a fish in the freezer to ‘humanely’ euthanise it. That’s horrendous as their blood cells crystallise before they die causing it a huge amount of pain! It’s not something that should be done at all!

    • Pure Goldfish June 18, 2015 at 6:18 pm - Reply

      Please don’t be upset, Sooz – freezing doesn’t hurt goldfish because they go to sleep and their heart stops before that actually happens.

  3. Enitsuj Eew June 25, 2015 at 12:45 pm - Reply

    I have a 4ft long, 3ft wide & 1ft deep pond. How many gold fish do you think I can have in that pond?

  4. naman October 7, 2015 at 5:35 pm - Reply

    i have 2 comet and 2 fancy what tank size should i have

    • Pure Goldfish October 7, 2015 at 5:42 pm - Reply

      Comets – 40 gallons apiece
      Fancies – 10-20 gallons apiece

      So at least 100 gallons. =)

  5. Sarah Elliott October 17, 2015 at 2:30 pm - Reply

    I just got a ten gallon tank, and I really want two (regular not the fancy) goldfish. Can they handle it, or should I just get one?

    • Pure Goldfish October 17, 2015 at 9:41 pm - Reply

      I’d advise one fancy goldfish for that tank size. Otherwise you will likely have two dead goldfish.

      Regular goldfish need much more space (40 gallons per fish). If you want more you might consider upgrading your tank =)

  6. Henriette Andersen October 29, 2015 at 11:59 pm - Reply

    Hi! i got a tank at about 33 gallons (125 liters), but because I got two internal biological filters (because goldfish are messy), I suppose there is a bit less room. I also have a thin layer of sand, and some drift wood with java fern and anubias, also taking up some room. Right know I’m waiting for the nitrites to go down during my fishless cycle.

    Is it ok with two fancies in here, or should I go “safe” with one? Since they are social, there would be negativities with just keeping one as well, so I don’t know what the best choice is.

    Thanks for the great articles!

    • Pure Goldfish October 31, 2015 at 4:07 am - Reply

      Hey Henriette, thanks for your kind words!

      If it was me I’d start with one and see how that goes. Keep track of the water quality for a while and see how it does, if there are no problems and it seems spacious enough in there than you could go for another one down the road.

      It would also depend on the size of the fish you wanted too… they don’t all grow the same. And with 2 fish in there they might not get a whole lot bigger than if you just had one, it could “spread out.” =)

  7. Nemirel November 2, 2015 at 2:47 am - Reply

    Hello I live in a dorm and i took my goldfish with me but i had to downsize my tank. my fish is about 3 inches long and the tank is about 2.5 gallons. do you think this will suffice or should I try and find a new home for him?

    • Pure Goldfish November 6, 2015 at 2:51 pm - Reply

      Yes, 2.5 gallons is much too small. He would not be happy or healthy in that for very long, I would advise finding him a new home as hard as that would be.

  8. Fish Fan November 17, 2015 at 2:52 am - Reply

    I have two young goldfish- a Comet named Helios, and a Shubunkin named Shark. They are in a 20 gallon tank. I that an okay size?

    • Pure Goldfish
      Clementine November 17, 2015 at 4:05 am - Reply

      Well, Fish Fan, it might be for a little bit, but slim-bodied goldfish (when taken care of right) grow fast… and big! It’s recommended to have 40 gallons apiece for them because they are pond fish and need that space to reach their full growth potential. That can be over a foot long for Helios and Shark 😉

      • Fish Fan November 17, 2015 at 4:43 am - Reply

        OK! Thanks!

  9. Alexis December 18, 2015 at 7:38 am - Reply

    Hi if I have 4 “fancy” gold fish with the split tail how bug of a tank would I need for the 4 of them?

    • Alexis December 18, 2015 at 7:39 am - Reply


    • Pure Goldfish
      Clementine December 18, 2015 at 4:35 pm - Reply

      Hi Alexis! At least 40 gallons is recommended. If you have the space or money than bigger is better, an 80 gallon would be especially comfortable for them =)

  10. Sparki December 29, 2015 at 3:52 am - Reply

    Hey! So, I have a sing common goldifsh (maybe 2 inches long) living in a ten gallon tank. Is that enough?

    • Pure Goldfish
      Clementine December 29, 2015 at 4:57 am - Reply

      It might be for a while, Sparki. But because commons grow so large it is recommended to get them a tank of 40 gallons or more per fish so they achieve their full potential.

  11. Rob February 5, 2016 at 7:21 pm - Reply

    We have one common goldfish that my daughters won two years ago. One fish. After reading up and how long they can live we’ve done upgrades and she (?) had become a beloved family pet. If our 10 gallon tank enough? The fish is about 3 inches long, excluding the tail.

    • Pure Goldfish
      Clementine February 5, 2016 at 11:43 pm - Reply

      Hi Rob! A 10 gallon tank is enough for a fancy goldfish (meaning the kind that have double-tails) but not enough for a slim-bodied goldfish (like the common). This is because they start out small but they can get to be over a foot in length. 40 gallons is the recommended minimum for them. Hope that answers your question.

  12. kawaiigoldies February 14, 2016 at 11:40 am - Reply

    I currently have two telescope eyed goldfish in a 40 gallon aquarium (160 litres). I saw a beautiful telescope at a local fish store. Do I have enough space for one more fancy… I desperately want it 🙁

    • Pure Goldfish
      Clementine February 14, 2016 at 11:41 pm - Reply

      Yeah you could do that. Just be sure to keep the water quality good.

  13. kawaiigoldies February 15, 2016 at 9:09 am - Reply

    Thanks very much for the quick reply 😀

  14. Gail February 15, 2016 at 7:07 pm - Reply

    I have 5 “carnival” goldfish in a 10gal tank and they seem very happy. But, should they have more space. One has been with me for over 7 years.

    • Pure Goldfish
      Clementine February 16, 2016 at 4:55 am - Reply

      Yes, absolutely, if possible I would highly advise that you give the fish at least a 50 gallon tank if they are fancies.

  15. Person February 16, 2016 at 2:55 am - Reply

    I have 3 common goldfish, what is the minimum my tank should be?

    • Pure Goldfish
      Clementine February 16, 2016 at 5:04 am - Reply

      120 gallons would be the recommended size, Person.

  16. Crazy fish February 16, 2016 at 6:47 pm - Reply

    Hi I have two common gold fish about two inches long each in a ten gallon tank should I upgrade because I am getting a algae eater that will grow about an inch.

    • Pure Goldfish
      Clementine February 16, 2016 at 6:52 pm - Reply

      Yes I would advise that you upgrade, because 10 gallons isn’t enough for even one common. But please don’t get an algae eater with goldfish, they don’t get along 🙁 If you have an algae problem you can try apple or nerite snails…

  17. person1 February 17, 2016 at 6:16 pm - Reply

    Hi I have three fancy goldfish, one oranda, one chinese lionhead and one black moor. They are in a 110litre tank with gravel, filter and decorations. Is this enough for them because I can’t get a bigger tank as not the space. I know I am just 6 gallons off 30 for minimum 10 gallons for each fancy.

    • Pure Goldfish
      Clementine February 18, 2016 at 5:13 am - Reply

      You can make due as long as the water stays super clean. It might mean a bit of extra work though.

      • person1 February 18, 2016 at 11:44 am - Reply

        Ok thank you for your advice. I am doing 20 percent water changes at the moment once a week. Should I keep doing this as it says in the manual to do them once a week for six weeks then once a month as a 25 percent water change.

        • Pure Goldfish
          Clementine February 19, 2016 at 5:17 am - Reply

          No don’t do what that manual says. That might work for tropicals but it spells death for goldfish. Weekly water changes of at least 50% forever 🙂

  18. suzanne February 20, 2016 at 11:45 pm - Reply

    hi I have a 60L tank and 1 fancy goldfish and one common coldfish they’re about 1 inch long each will I need a larger tank soon and what size tank will I need?

    • Pure Goldfish
      Clementine February 21, 2016 at 1:52 am - Reply

      Yes, you will need a larger tank – 40 liters for the fancy and 150 liters for the Common, so 190l. Commons get enormous.

  19. person1 February 20, 2016 at 11:51 pm - Reply

    Ok from now on I will do 50 per cent weekly water changes. When I do the water changes I take the goldfish out the tank and into a small tank whilst I clean out as its easier for me that way. Thank you for your help.

  20. Patti February 27, 2016 at 4:21 am - Reply

    I’m looking to buy a 90 gal aquarium as a holding tank for 3 Sarassa comets all under 6″. I have a 300 gal indoor pond but due to leaving tank in care of another person lost 12 larger Shubunkins and sarassas. I’m going to use the 300 gal as quarantine for new fish and buy a 90 for my survivors. What kind of filter would you recommend for this new tank and next fall what would be stocking rates for it? All my pond fish live in a 3000 gal pond during the season and spend 6 months indoors in heated basement.

    • Pure Goldfish
      Clementine February 28, 2016 at 4:40 am - Reply

      What kind of filter you will get depends on how dense you will be stocking. If your setup is pretty packed a canister or sump might be the best option. If it’s medium or light, sponge filter would be good.

  21. Cristhian February 27, 2016 at 10:46 pm - Reply

    I’m thinking of getting a 55-gallon tank about how many regular goldfish should i get?

    • Pure Goldfish
      Clementine February 28, 2016 at 4:42 am - Reply

      By regular, do you mean fancy or slim-bodied, Cristhian?

      • Cristhian February 28, 2016 at 7:11 am - Reply


        • Pure Goldfish
          Clementine March 1, 2016 at 4:53 am - Reply

          Then, you should only have one in a 55 gallon. They grow to be over a foot long so they need the space. 🙂

  22. Francine February 29, 2016 at 5:30 pm - Reply

    Hi, Im thinking of buying Wakin goldfish. I’m not sure if they are considered fancy or not because they don’t technically have a single tail. Anyway, I can only do a 90 gallon tank. Would a pair or even 3 be ok in there? Thank you!

    • Pure Goldfish
      Clementine March 1, 2016 at 5:05 am - Reply

      Wakin are classified as slim-bodied, even though they have double tail, and they grow to be very large. A pair would do fine in a 90 gallon tank, but 3 would probably be a bit too many.

      • Francine March 2, 2016 at 4:04 am - Reply

        Ok thank you very much!

  23. Jodi March 6, 2016 at 2:49 am - Reply

    So I have a question. When I was younger I had a goldfish for 12 yrs. Same goldfish! His name was Cleo. Well when he died he measured 11″. He lived in a 5 gallon tank. He was constantly swimming and “thriving.” Why is it that it’s no longer okay to have them that way? Obviously he was cared for properly or he wouldn’t have lived that long or gotten his full size.

    • Pure Goldfish
      Clementine March 6, 2016 at 5:08 am - Reply

      Thank you for your question, Jodi! Goldfish are strong creatures, especially slim-bodied ones like Commons and Comets. These fish can be amazingly hardy and survive even in extreme situations, though it isn’t often heard of (for the reasons described in this post). However, that does not mean they are as comfortable as they would normally be. Can they survive and appear happy? Of course. Is it ideal? No.

      As owners, we should do the best we can to ensure our pets live in an environment that provides as much living space as possible. This prevents such conditions as stunting (permanent) and water poisoning (all too common). If a person was given cleanly conditions and food when needed, hypothetically speaking they could live in a hotel-room sized enclosure all of their life and appear to thrive. But nobody would want that. We’re made to have more room to move and grow. But that is the goldfish’s equivalent of life in a bowl or undersized tank. I am glad for your sake your fish made it as long as he did in those conditions; sadly, goldfish rarely can survive very long in such a space and yours was definitely an exception.

      Hope that makes sense. 🙂

  24. Nicole March 16, 2016 at 12:25 am - Reply

    I have 3 comets, ive heard some people say 55g and some say more. Help!

    • Pure Goldfish
      Clementine March 17, 2016 at 4:09 am - Reply

      Hi Nicole! Comet goldfish fall into the slim-bodied goldfish category, which need 40 gallons apiece. 40 X 3 = 120 gallons is the size you would need because they grow so large and need that space to move comfortably.

  25. Kristal March 25, 2016 at 11:49 pm - Reply

    I have e a 120 gallon small pond in the back yard. I got 4 goldfish and one unfortunately seemed sick from the start and passed away after only 9 days. I am wondering if my pond is too small for 4 ? Its only been 2 days since he lassed but I was thinking of getting a new one this weekend but am worried about introd icing a new one. . Is it okay?

    • Pure Goldfish
      Clementine March 26, 2016 at 3:54 am - Reply

      If you are keeping slim-bodied goldfish, then yes, 120 g is too small… you should have at least 160. I wouldn’t get another one at this point, just focus on making sure the fish you have stay well.

  26. Thomas March 28, 2016 at 11:04 pm - Reply

    Thanks so much for this article. I’ve been frantically searching for information, and this is the most informative article I’ve found. I have a 300-gallon livestock tank, which I’ll be using to make a sort of above-ground pond. Are the rules the same for outdoor ponds, as for aquarium tanks? Hypothetically, 4 shubunkin at 40 gallons each would be 160 gallons, and then I could have up to 14 ryukin or oranda? Are the proportions different when I’m creating an ‘ecosystem?’ I’ll have oxygenating plants, snails, bog plants, etc.

    • Pure Goldfish
      Clementine March 30, 2016 at 3:56 am - Reply

      I’m glad you found it useful, Thomas! Yes you are right, the same guidelines apply whether in a pond or in an aquarium. 🙂 Ponds are prone to the same problems as indoor tanks when overcrowding happens, as both are miniature ecosystems.

  27. Quackers April 4, 2016 at 8:54 pm - Reply

    hi, i’ve just bought home a small (3cm) oranda goldfish who has lovely black eyes. Seems happy in my 40ltr tank, at the moment its eating special goldfish granules and bloodworm. i would like to now if it is still to young for live brine shrimp. i was told mixing its diet to much while small could cause health problems, the store was insistent that the granules alone were fine. i keep 3 other tanks but there all tropical, this is my first fancy goldfish.

    • Pure Goldfish
      Clementine April 7, 2016 at 4:16 am - Reply

      Brine shrimp is a great food for maturing fish, but it has to be carefully limited meaning don’t feed too much at once.

  28. Ann April 7, 2016 at 6:22 pm - Reply

    I have to differ with you about freezing fish to euthanize. I agonized over this issue when my prize pet goldfish of 11 years (in my pond) had to be euthanized. I finally found this info and this method worked beautifully. [link removed]

    • Pure Goldfish
      Clementine April 8, 2016 at 4:56 am - Reply

      There are certainly many options out there for euthanasia, if you found one that works for you great 🙂

  29. Fish life April 10, 2016 at 12:07 am - Reply

    I want to get 1 goldfish. The kind you find at the local pet store. The ones that r all gold. How many gallons do I need? I need to place it in my room, and it’s pretty small. I want to buy a bowl at Dollorama. How big???

    • Pure Goldfish
      Clementine April 11, 2016 at 3:51 am - Reply

      If you get a fancy goldfish (the kind with two tails) they will need 10 gallons each at least. A slim-bodied goldfish with just one tail will need 40 gallons. Goldfish don’t do well in bowls, please be sure to get a proper tank if you want them to live a long time 🙂

  30. Fish life April 10, 2016 at 12:13 am - Reply

    i already got 5 goldfish. I do water change when water looks blurry. I want to get another goldfish. In a separate tank. How big does that tank need to be? I’m changing my 5 goldfish’s tank in a few years anyways, so I’ll get it big enough for the 6. How big does my tank need to be for that single goldfish right now?

    • Pure Goldfish
      Clementine April 11, 2016 at 3:52 am - Reply

      If you change the water when it doesn’t look blurry you will have a better time.

  31. karin April 11, 2016 at 9:32 pm - Reply

    I disagree with the size of tank requirements, 40 G for two goldfish? We have a large old bathtub used as pond in summer aprox. 150 gal, and have to bring the fish inside in winter into a much smaller aquarium. The aquarium about 40 gal. we had a pleco and six goldfish. Two filters (hang outside tank type) and did weekly 30% water changes, used waste control and cycle by nutrafin, and the fish thrived, pleco is now 5 inch, and largest goldfish is 8 inched. The goldfish are fat, shiny, healthy fins, get along, what’s the problem?

    • Pure Goldfish
      Clementine April 12, 2016 at 4:11 am - Reply

      40 gallons would be able to house 3 or 4 fancies, or one slim-bodied one. No doubt goldfish can and have done well in smaller spaces than what is recommended, it’s just a matter of the water volume being able to afford more in terms of growth and optimal quality, allowing them to live to their full lifespan.

  32. Fish life April 13, 2016 at 10:33 am - Reply

    If I get 10 gallon for 1 fancy, when do I have to switch to bigger

    • Pure Goldfish
      Clementine April 14, 2016 at 4:25 am - Reply

      As soon as you can, I would recommend.

  33. Josh May 11, 2016 at 1:53 pm - Reply

    Hi, I currently have one small ryukin goldfish in a ten gallon (Wasabi). How big of a tank should I have just for him? If I need to, when should I upgrade the tank?

    • Pure Goldfish
      Clementine May 12, 2016 at 4:01 am - Reply

      10 gallons is the minimum amount of space for 1 Ryukin. If you want to upgrade down the road, feel free to give him as much as you can 🙂

  34. Jo May 16, 2016 at 8:58 pm - Reply

    My son got a tiny goldfish in a “starter tank” of about 9L which it has rapidly outgrown. We have bought it the biggest tank we can fit and afford which is 60L. The fish is only 2 inches at the moment. Hopefully the new tank will let him grow nice and big- but when will he out-grow it?

    • Pure Goldfish
      Clementine May 17, 2016 at 3:45 am - Reply

      Hmm, what kind of fish do you have Jo? If he is a fancy then the size you have is fine.

  35. Hannah Lunde May 30, 2016 at 3:03 pm - Reply

    Hi! I just bought a tank at 60 gallons for my fancy and wakin! 😀 I can’t wait to put them in. But since it is such a big tank my dad told me that I should buy three orands for the fish tank. Buy I am not sure If I have enough space for them. Can I have one more goldfish in there??

  36. Hannah Lunde May 30, 2016 at 3:05 pm - Reply

    Btw This website is very helpful!! Thank you??

    • Pure Goldfish
      Clementine May 31, 2016 at 2:41 am - Reply

      Glad you like the site, Hannah! Hmm, for a 60 gallon tank with a fancy and a wakin, you might have enough room for one Oranda (not 3). It’s the Wakin that requires so much space, because they grow huge. They need 40 gallons. 10 gallons min for each fancy. But things will be easier the fewer fish you have, so I might just stick with the wakin and fancy if I were you 🙂

  37. Hannah Lunde May 31, 2016 at 2:13 pm - Reply

    Thank You for reply! I was thinking that One more goldfish would be great company! But I guess I’ll stick with those two:-) But do You think They will have a Happy life Even though it’s just them? Heh heh Sorry for asking so much but I really want them Too have Good lives. I have grown quite fond of them you see! ?

    • Pure Goldfish
      Clementine June 1, 2016 at 4:07 am - Reply

      I am sure they will have a fantastic life with you as their owner, and each other for company 🙂 It is so easy to become attached to them!

  38. Hannah Lunde June 1, 2016 at 1:57 pm - Reply

    OK thank you!?

  39. Sarah_Cyanide June 1, 2016 at 5:05 pm - Reply

    I have an 80 gallon tank with 4 fantails and 1 oranda. Is that a good size if I kept it at just those 5?

    • Pure Goldfish
      Clementine June 4, 2016 at 2:01 am - Reply

      Yep 🙂

  40. Bob270009 June 4, 2016 at 3:21 pm - Reply

    How many goldfish can I have within a 40 gallon tank and 5 Cory cats?
    Thnx loved the article

    • Pure Goldfish
      Clementine June 5, 2016 at 4:14 am - Reply

      You can have 4 fancies with no Corys, which I would definitely recommend. Their needs are totally different. 🙂

  41. orandafan June 4, 2016 at 11:08 pm - Reply


    I plan on getting fish for 54L tank. I plan on having some plants, maybe Ampullariidae Pomacea, and some kind of cleaner fish – maybe Hypostomus plecostomus + one oranda (I would really love to have two but it seems like it would be not enough water for both?)

    Thank you

    • Pure Goldfish
      Clementine June 5, 2016 at 4:19 am - Reply

      Don’t do a cleaner fish PLEASE! Sooner or later they end up chewing on goldies. One goldie with no other fish would be perfect for that size tank, two would be too crowded.

      • orandafan June 5, 2016 at 12:41 pm - Reply

        Ohh! I had no idea cleaner fish could be dangerous, did not find any info about that. Thank you very much. One oranda it is then 🙂

        • Pure Goldfish
          Clementine June 6, 2016 at 2:10 pm - Reply

          Great, your fish will thank you for it 🙂

  42. Alex June 5, 2016 at 4:54 pm - Reply

    I’m getting a 46 gallon for a fantail and a oranda
    And my uncle is thinking of giving me a 55 putting a comet
    And he has a 29 which I’d put baby ryukins

  43. Alex June 5, 2016 at 4:55 pm - Reply

    Can I add anymore fish in there

    • Pure Goldfish
      Clementine June 6, 2016 at 2:11 pm - Reply

      You mean, in the 46 gallon? Yeah you could probably add another fish in that. The 55 for the comet isn’t big enough for more fish.

  44. yessenia June 6, 2016 at 3:43 pm - Reply

    I have 3 gold fish and 1 betta what tank should I need

    • Pure Goldfish
      Clementine June 8, 2016 at 2:40 am - Reply

      You will need 2 tanks, at least a 30 gallon (if you have fancies) for the goldfish and a 2.5 gallon for the betta. The goldfish will outgrow the betta and eat it. :/

  45. Hannah Lunde June 10, 2016 at 12:36 pm - Reply

    Hi Clementine! Glad to report that my two goldfish (fancy and wakin) have moved over to their new 60 gallon tank! ?Everything went super, and they are not showing any signs of stress. Especially my wakin seems to enjoy all the space to to swim in since he is not used to that! ? Thank you for all your advice ?

    • Pure Goldfish
      Clementine June 11, 2016 at 4:24 am - Reply

      Yay 😀

  46. amy June 12, 2016 at 3:45 pm - Reply

    Hi I have 6 common goldfish what size tank would be best for them?

    • Pure Goldfish
      Clementine June 14, 2016 at 1:29 am - Reply

      6 X 40 = 240 gallons. You may want to consider a pond… 🙂

  47. An June 13, 2016 at 4:29 am - Reply

    hi i have one common goldfish, how much water should my fish have?

    • Pure Goldfish
      Clementine June 14, 2016 at 1:33 am - Reply

      40 gallons, because he or she is a slim-bodied fish and will grow very large 🙂

  48. bill June 22, 2016 at 4:45 am - Reply

    hi i have two ryukins that are in a 5 gallon tank for now because they are still small and i am planning to move them in to a much bigger tank the only problem is that i don`t know the right size

    will a 20 gallon tank work great ? because that`s the only size i can afford both money and space

    and if ever you agree with the 20 gallon tank for my ryukins, can i add another ryukin in there?

    thank you in advance

    • Pure Goldfish
      Clementine June 23, 2016 at 4:26 am - Reply

      I wouldn’t put more than 2 ryukins in the 20 gallon, it would be maxed out as is. Congrats on upgrading!

  49. muhammad amin June 26, 2016 at 8:18 pm - Reply

    i have 5 gold fish and two Pangasius Catfish in a 5 gallon tank . i have no filter . so after how many weeks i change the water . how many times in a day should feed them.

    • Pure Goldfish
      Clementine June 27, 2016 at 2:49 am - Reply

      For that many fish in that size tank, you will need to do daily 100% water changes and feed sparingly once daily. They will produce so much waste that the tank will foul very quickly. I would highly recommend getting a bigger tank as soon as you can, at least a 50 gallon for the goldfish and a separate tank for the catfish as they will pick on the goldfish sooner or later. Then you can do a weekly water change and normal feeding.

    • Reagan October 7, 2017 at 12:50 am - Reply

      Hello! I have a 40 gallon breeder with a 50 and 20 fluval aquaclear HOB filters. The tank holds one oranda and one fantail goldfish. Is this too small for them? I was going to get either a fluval aquaclear 70 or another 50 filter to replace the 20. The tank also has a bacto sponge filter and a large bubble disc to oxygenate the water 🙂 is this a proper home for them? Or should I go bigger?

      Rating: 5
      • Pure Goldfish
        Clementine October 22, 2017 at 11:19 pm - Reply

        No, I think your stocking is good. 🙂 But bigger is always better if you want.

  50. Didu June 28, 2016 at 9:35 pm - Reply

    I have a 23 gallon tank with 2 fantail gold fish is this good enough? They are babies

    • Pure Goldfish
      Clementine June 29, 2016 at 2:20 am - Reply

      Yeah that’s fine 🙂

  51. FelixTheRedCappedComet July 3, 2016 at 1:02 am - Reply

    Hello! 😀 This is the owner of the late Clyde, the little red and black telescope eye goldfish, who was having gulping issue :/
    I’m back again for a quick question:
    I’m left with one fish.

    I used to have two, but Kevin, the red and white ryukin, sadly passed away on Thursday, June 30th, leaving Felix all alone.

    Felix lives in a 40 gallon tank, with an Aqueon filter that filters 400 gph. I’m being told by many goldfish “experts” that Felix is “suffering” and “is doomed” in a tank that size. I plan on getting a 75 gallon tank, once I save up 300 bucks, not to mention a stand and new filter..
    Felix seems happy as a lark. He will follow me around the tank, begging for food, because, as we all know, food and goldfish go together like PB and J xD
    He will be 3 years old in my care sometime in October. My tank parameters are 0 for Ammonia and Nitrite, 15 ppm for Nitrate, and 7.2 for pH. I use the API Master Freshwater Test Kit 🙂
    Anyways, I don’t think he is suffering at all. I plan on getting a second common/comet type fish, and housing them in my second 40 gallon just across the room. I’ve given up on fancy goldfish.. too fragile.. 😛

    Do you think that Felix is “miserable” in his tank? 😛


    • Pure Goldfish
      Clementine July 3, 2016 at 4:12 am - Reply

      Felix is not suffering or doomed in a 40 gallon tank by himself. In fact I want to congratulate you for providing him with the perfect sized home 🙂

      • FelixTheRedCappedComet July 3, 2016 at 8:32 pm - Reply

        Thank you! 🙂

  52. Goldielocks July 3, 2016 at 9:28 pm - Reply

    Hi! thanks for the great articles, I’m new to goldfish but not to the hobby in general. I have a 50 gal, I was wondering how many fancies I can keep in it without getting crowded? Thanks!

    • Pure Goldfish
      Clementine July 3, 2016 at 9:53 pm - Reply

      I would stick with no more than 4 personally, though with lots of water changes you might be able to do 5.

      • Goldielocks July 5, 2016 at 3:59 pm - Reply

        Thanks so much for responding! I’m going to stick with four, but do the amount of water changes I would do for five, so how many would you suggest?

        • Pure Goldfish
          Clementine July 6, 2016 at 4:07 am - Reply

          For five you would probably want to do at least 2 per week, one 90% and one 25-50%.

  53. Aaron July 6, 2016 at 3:42 am - Reply

    I have tworked carnival gold fish not the fancy kind and they are in a 20 gallon tank with plenty of room right now. Should I upgrade or is 20 good?

    • Pure Goldfish
      Clementine July 6, 2016 at 4:08 am - Reply

      Since slim-bodied goldfish grow so large (and most owners want them to get large and healthy) it is recommended to have at least 40 gallons each for them. I would upgrade if you could 🙂

  54. Lara July 10, 2016 at 4:40 am - Reply

    Hello i was wondering if my tank is to small i have 2 small goldfish in a 20 litre tank

    • Pure Goldfish
      Clementine July 10, 2016 at 2:42 pm - Reply

      Yes that is too small. Size of the fish doesn’t matter because they grow big with good care 🙂

  55. Beatriz Abreu July 13, 2016 at 12:59 pm - Reply

    I have a single goldfish (shubunkin) in a 6 gallon tank. Is this okay? He was recently bought so he is still very small. Please help!

    • Pure Goldfish
      Clementine July 15, 2016 at 6:15 pm - Reply

      6 gallons is a bit too cramped for a shubby. They grow really big, 12 inches plus, very quickly in the right conditions… he would do much better in a 40 gallon or even a pond 🙂

  56. Mahesh July 14, 2016 at 1:15 am - Reply

    Hey, i have 2 sunhunkins and 4 fancies in my 70 gallon tank, is that overcrowded??

    • Pure Goldfish
      Clementine July 15, 2016 at 6:18 pm - Reply

      Yeah that’s a little too much. It would be big enough for the two shubbies if you didn’t have all those fancies.

  57. fatma July 22, 2016 at 11:52 am - Reply

    i have 8 goldfishes and the tank is 270 liters is that good or no?

    • Pure Goldfish
      Clementine July 22, 2016 at 4:48 pm - Reply

      Kind of cramped… I wouldn’t do more than 6.

  58. Katie July 24, 2016 at 5:47 am - Reply

    Is a 75L tank big enough for two fancy goldfish?
    I only have one at the moment but would like to get him a friend.
    Also, what other species are compatible with fancies that I could put in if 75L is too small for two goldfish?

    • Pure Goldfish
      Clementine July 24, 2016 at 3:18 pm - Reply

      I wouldn’t do more than 2 goldfish, really one is best for that space, but if you do enough water changes you could squeak in a friend.

  59. Isabella August 2, 2016 at 8:37 pm - Reply

    Hi:) I reallllllllllly want a black moor goldfish but I’m not sure what tank to get him. I read in petsmart that he will need 29 gallons at the least, but then I read somewhere else that he needs 10 at the least. I don’t want to spend a lot of money and I don’t have a huge amount of space but I am willing to save up for a big tank if I need to. What is the absolute smallest tank for a black moor? If I do get a fish what type of filter should I get?

    • Pure Goldfish
      Clementine August 3, 2016 at 3:58 am - Reply

      10 gallons bare minimum. 20 would be better though. 🙂 Sponge is my favorite.

  60. Susan August 5, 2016 at 3:10 am - Reply

    Your article is great. What I would like to know is how fast do goldfish grow and how much and how often do you feed them? Are there treats they can have? Thanks a lot for your time.

    • Pure Goldfish
      Clementine August 5, 2016 at 3:35 pm - Reply

      Thank you, Susan! Growth rates are determined by a lot of factors such as temperature, food and age. How much/often you feed them is also determined by those things. Some good treats are live foods such as brine shrimp or bloodworms, but there are many others.

  61. shannon August 12, 2016 at 1:48 pm - Reply

    i had 3 regular gold fish in a 29 gal tank. i realize after reading this they needed more room. had one for over 9 years and the other 2 for over 5. one died Wednesday and the oldest friday. they started with a white film covering their entire body and one lying on his side at the bottom of the tank. did a partial water change 50-75% and treated water same as for the last 9+ years. the 2 left seemed to get better but today woke up and one was dead and the other struggling. what is going on?

    • Pure Goldfish
      Clementine August 13, 2016 at 4:03 am - Reply

      Hmm, have you tried testing the water, and what is the setup like as far as normal water changes, gravel, filter cleaning, etc?

  62. xander August 13, 2016 at 10:20 pm - Reply

    Hi I have just took in a goldfish from someone for some reason was going to kill him off a bit drastic. Anyway I haven’t had much to do with goldfish as I keep tropical fish, so I am unsure what type he is I think he is fancy but again not sure he is around 5 inches hence we have named him hagrid. I currently have him in a 60 litre tank is that big enough and is he OK alone. Thanks

    • Pure Goldfish
      Clementine August 16, 2016 at 4:17 pm - Reply

      What kind of fish is Hagrid – fancy or slim-body? Fine if he is a fancy, you would need a bigger tank for a friend though 🙂

  63. Xander August 17, 2016 at 2:32 am - Reply

    Thanks for response, I think he may be a fancy, however im not too sure if i can get him to stay still so i can get a picture to take a picture of him to take to my local pet shop, I have decided he would be better suited in a pond but cannot dig 1 into my garden so luckily have found that i can get a 165 litre mixing bath which can be used with plenty of plants for him.

    • Pure Goldfish
      Clementine August 18, 2016 at 3:55 am - Reply

      Great to hear 🙂 I’m sure he will be very happy in there.

  64. Mkristovskis August 22, 2016 at 6:22 am - Reply

    Hi, i have just bought two (currently small) comet’s and I’ve got a 28 litre/7.5 gal tank. Is this too small? If so, what size tank would you recommend especially if i am looking to buy some more in the future.

    • Pure Goldfish
      Clementine August 23, 2016 at 1:48 am - Reply

      Yes, Mkristovskis, that is too small for 2 comets. Depends on how many you plan to get, the rule is 40 gallons per slim-body (comet).

  65. New Goldfish Owner August 22, 2016 at 4:19 pm - Reply


    I just won 3 goldfish at a fair last night. I kept them in a bowl overnight; it’s all I had. Unfortunately, these are my first goldfish since I was a kid so I’m not sure what proper care is. One of them died last night so I changed the water again this morning, but I’m not sure if the other 2 will make it. What is the minimum recommended tank size for them? I’m willing to get them proper care, just don’t know where to start…

    • Pure Goldfish
      Clementine August 23, 2016 at 1:54 am - Reply

      Hey New Goldfish Owner! The size of tank depends on the type of goldfish and how many you have, most fair fish are slim-bodied breeds (like the common and comet) and need 40 gallons apiece. The smaller fancies need 10-20 gallons each. As far as proper care goes, I really think the best place to start is to check out our book. It is a complete care plan for feeding, tank maintenance, tank setup, healthcare, and everything else you will need to know. Plus, it comes with one-on-one goldfish support throughout your goldfish journey so you can get personalized help if you get stuck. 🙂 Hope this helps!

  66. Kaitlyn August 22, 2016 at 11:04 pm - Reply

    Hi. We have two outside ponds made from a tractor tire. We have 2 of the single tail goldfish and 5 of the fancy goldfish in one pond and about 10 of the single tail goldfish in the other pond. All of these are this years fish except the single tail (not sure how old they are – someone had them raising them in an aquarium. We are gonna have to bring them inside over the winter due to the pond is not deep enough and it will freeze. How many and how big of tanks for you think we need?

    • Pure Goldfish
      Clementine August 23, 2016 at 3:53 pm - Reply

      For the single tails, you will need 12 (single tails) x 40 (gallons each) = 480 gallons. For the fancies, you will need 5 (fancies) x (10 min gallons apiece) = 50 more gallons. Hope that helps 🙂

  67. Leslie August 27, 2016 at 11:18 pm - Reply

    I have 3 feeder goldfish that have grown to about 4 inches each. I just wanted to see how big they would get and found myself living them!!! I have fine research on plants they like and bought them some. But I have them in a 13 gallon tank. Do I need a bigger tank? They seem happy and follow me around the tank. They hide in the plants and nibble on them too. Thanks in advance!!

    • Pure Goldfish
      Clementine August 28, 2016 at 3:36 am - Reply

      Yes, definitely bigger 🙂 They sound like a lot of fun!

  68. Daya August 29, 2016 at 5:33 pm - Reply

    I have 8 goldfish 3 Comet goldfish and 4 I got out of the feeder fish from the pet store thinking they are common goldfish. I also have one algea eater. Just realizing the tank I have them in is wayyyy to small. The stupid box said that with a 10 gal you could keep 10 goldfish. How big of a tank do I need to upgrade to? I’m renting and I don’t think our landlord would let us dig a pond.

    • Pure Goldfish
      Clementine August 29, 2016 at 11:00 pm - Reply

      8 slim-bodied goldfish? That would be 8 (fish) x 40 (gallons each) = 360 gallons. A pond would be nice…

      • Daya August 30, 2016 at 1:02 am - Reply

        Alright thank you. I may just get them a 75 gal tank keep them until they’re to big and then find someone who has a pond to give them to…

  69. Kim August 31, 2016 at 3:50 pm - Reply

    So, I have a common goldie, named Smiles, in a ten gallon fish tank (I know it’s bad). I guess I didn’t do enough research. I saw something saying 10 gallons for every goldfish. But anyway, I’m trying to save my pennies up for a 30 gallon. I’m worried he’ll become stunted before I can afford it. So my question is, if he does become stunted and I get him in a 30 gal, will he continue to grow or will he be stuck the size he is?

    • Pure Goldfish
      Clementine August 31, 2016 at 5:33 pm - Reply

      Temporarily he should be fine. I wouldn’t wait longer than a year though.

  70. Rebecca DuRocher September 2, 2016 at 1:37 am - Reply

    I have 4 orandas and 1 telescope goldfish. The biggest one is 3-4 inches (body, not including tail). Would they be okay in a 53 gallon tank for awhile?

    • Pure Goldfish
      Clementine September 2, 2016 at 11:49 pm - Reply

      If you don’t overfeed they should be 🙂

  71. Pamela September 4, 2016 at 12:30 am - Reply

    We have a 28 litre tank and 4 small split fin gold fish, do you think our tank is too small? The pet shop didn’t say anything.

    • Pure Goldfish
      Clementine September 5, 2016 at 3:07 am - Reply

      Hey Pamela 🙂 Yes that is definitely waaaaay too small. Pet stores are famous (or should I say infamous) for not understanding the needs of goldfish, which is partly why we wrote The Truth About Goldfish to correct all the misinformation.

  72. Demon September 5, 2016 at 7:03 pm - Reply

    Is a ten gal good for a male Japanese and female Bristol shubunkin they are tiny

    • Pure Goldfish
      Clementine September 6, 2016 at 3:26 am - Reply

      Nope, see the golden rule above 🙂

  73. Demon September 7, 2016 at 7:17 pm - Reply

    Would a koi eat smaller fish

    • Pure Goldfish
      Clementine September 8, 2016 at 3:29 am - Reply


  74. julia September 9, 2016 at 2:50 am - Reply

    i have 9 fish that are about one inch long each at the max. I got them at a festival. they are in a 3 gallon tank. 1. Is this big enough? 2. can i also get an oto algae eater?

    • Pure Goldfish
      Clementine September 9, 2016 at 4:01 am - Reply

      1. No. 2. No. 😉

      Size doesn’t matter as small fish produce lots of ammonia. Algae eaters will prey on goldfish.

  75. julia September 9, 2016 at 2:58 am - Reply

    P.S. they are comets and they have a tank with a filter and a lighting system.

  76. holy moly September 12, 2016 at 1:56 pm - Reply

    I won 3 comet goldfish at the fair yesterday. one of them, Dayman, died last night. i dont have a container for them, or a filtration system. they are currently about 3/4 inch long. i have them in a 1/2 gallon jar. i have a koi pond that is currently broken but fixable. how long can i keep them in their jar? i know its bad. i will change the water regularly.

    • Pure Goldfish
      Clementine September 13, 2016 at 3:59 am - Reply

      The less time you keep them in the jar the better! I wouldn’t do more than a day. 🙂

  77. Patricia Rowland September 21, 2016 at 11:07 pm - Reply

    Ihave 1x10inch pearl scale and 1x7inch think its fancy tail in together in 290litre tank. The pearl scale has been on his side on bottom of tank for about 3 mths only swimming for feed or when i call him he can spend hours sporning with his female tankmate but goes back to bottom on his side. I have tried many solutions to help but to no avail. This has only happened since they were moved downstairs. So im thinking he might be sulking.
    My question is can they be moved to a 145litre tank. So i can move him back to my dining room where he used to be very social and interactive with me contantly. I rent house and am only allowed 145lt or smaller tank in the house.. water paramiters are all good. Tried salt baths anti fungal anti bacterial constant water changes made tank bare bottom/no gravel. Installed heater for contant temp. Any other ideas would be appreciated. Thankyou

    • Pure Goldfish
      Clementine September 23, 2016 at 2:43 pm - Reply

      Yeah that’s big enough.

  78. Gabi September 22, 2016 at 4:06 pm - Reply

    Hello Clementine,

    I have a 20 gallon long aquarium with one Oranda, (name Saturday), three inches long, and one Ranchu, (name Ranchu Wiggly), one inch long. Do you think my aquarium is too small?

    P.S. My filter is Aqua Clear 50. Tetra Whisper Air Pump 40, and live plants with a medium gravel.



    • Pure Goldfish
      Clementine September 23, 2016 at 2:46 pm - Reply

      It’s pretty small but it depends on how you take care of it.

  79. Maggie September 29, 2016 at 2:18 pm - Reply

    Would 75 gallons be enough for two sarasa comets and one black moor?

    • Pure Goldfish
      Clementine September 30, 2016 at 4:05 am - Reply

      Not quite :/

  80. Kaye October 9, 2016 at 9:48 pm - Reply

    Hi! I have two 1.5 inch commons/comets in a 20 gallon tank. I know that’s too small so I was wondering how long it would be until they will probably about grow it. I have my eyes on a 125 gallon but unless they out grow the 20 gallon my parents won’t approve on another tank.

    Thank you!

    • Pure Goldfish
      Clementine October 10, 2016 at 2:29 am - Reply

      Goldfish usually grow about an inch a year, so that should give you some idea 🙂

  81. JD October 14, 2016 at 7:59 pm - Reply

    Hello! I was curious when you are doing the fishless tank cycle preparing for a new aquarium, is it best to have plants in from day one as you add ammonia or should plants be placed in when the cycle has completed (3-4 weeks)?

    • Pure Goldfish
      Clementine October 16, 2016 at 10:27 pm - Reply

      Later on is probably better.

  82. Magnus October 21, 2016 at 1:43 am - Reply

    I currently have a 20 gallon tank with a comet and an oranda goldfish. I know that it is currently too small but very soon in the future I am getting a 48 inch, 65 gallon tank for them. Would I possibly be able to get one more fancy goldfish for the 65?

    P.S. I will have double filtration for the 65 and do 3 weekly 50% water changes.

    Thanks, Magnus

    • Pure Goldfish
      Clementine October 22, 2016 at 3:53 am - Reply

      That should be fine. 🙂

  83. Raman October 28, 2016 at 10:43 am - Reply

    I have 90 gallon tank. Can I have 8 fancy goldfish and one black moor fish

    • Pure Goldfish
      Clementine November 1, 2016 at 3:57 am - Reply

      Pushing it… personally I wouldn’t do that many.

  84. Lee November 2, 2016 at 4:45 pm - Reply

    Hello! We are getting 3 middle sized fancy goldfish. And we were wondering how big the tank should be. And what kind of equipment will be good. How many times a month should we clean the bowl? We hope you can answer. Thank you. 😀

    • Pure Goldfish
      Clementine November 3, 2016 at 4:15 am - Reply

      3 fancies would do well in a 45 gallon tank. As for your other questions, they require a much more detailed answer than I can give here. I would highly suggest checking out our book – it contains that as well as everything you will need to know. 🙂

  85. wendy November 11, 2016 at 4:00 am - Reply

    I have 5 comet goldfish in a 10 gallon tank is it to small for them

    • Pure Goldfish
      Clementine November 13, 2016 at 12:57 am - Reply

      Yes it definitely is too small 🙁

  86. Kara November 14, 2016 at 9:21 pm - Reply

    I have one oranda who was only bought in July and he was a baby then. Hes grown a little bit but I’m worried he’s going to be stunted. Pet shops are useless sources of info so I have no one to really ask for advice. Hes been in a 60l tank that’s a half moon shape from day one. It’s got a filter and I do a 50% water change a week and always add my water safe and filter boost. Is this alrigt? Should I be feeding him anything special? I give him sinking pellets because he got swim bladder and was advised to give him frozen peas which seemed to work. But yeah am worried about him

    • Pure Goldfish
      Clementine November 26, 2016 at 7:28 pm - Reply

      Setup sounds good, unless you are seeing symptoms of a problem.

  87. Tayla November 14, 2016 at 11:11 pm - Reply

    This article has been incredibly helpful! Yesterday I adopted my neighbour’s two goldfish (I don’t know the breed, but they’re the black ones with the big googly eyes). Straight away I knew that I needed to get them a tank. The poor little guys are a year old, around 4inches long and stuck in a little bowl 🙁
    I started looking into 10L tanks thinking it would be big enough until I came across this article. Wow! I knew they needed more room, I just didn’t realise how much! But I do want to know, since they have lived in this bowl for a bit over a year now, would upgrading them to such a large tank straight away be a shock to their system? I don’t want to think I’m doing the right thing by giving them a nice gigantic tank to live in, only to cause them severe stress or worse. Thanks in advance!

    • Pure Goldfish
      Clementine November 26, 2016 at 7:29 pm - Reply

      Glad you found it useful, Tayla! Upgrading is definitely a good idea as long as you keep your filters and do the required maintenance.

  88. Vishwa November 15, 2016 at 5:49 am - Reply

    Hi thanks for the Forum… very informative and helpful…
    1. I am new to Fish Keeping. Right now, I own 2 Gold Fish, slims, in 63 liters (~16 gallon) of water. Is this good?
    2. At what frequency the water change to be done? The shop keeper over here told to to 25% water change every week.
    3. In your experience how should the aquarium to be dimensioned. I mean, Width X Depth X Height. Any aspect ration recommendations? (My aquarium is 1.5 ft X 1 ft X 1.5 ft)
    4. I have a water filter fit in the aquarium. Do I need to buy a air filter too? if yes, Why?
    5. The shop keeper recommended me to buy a heater. His point was, heater keeps anchor worms and other parasites away. How much its true?

    • Pure Goldfish
      Clementine November 26, 2016 at 7:31 pm - Reply

      Your tank is a bit too cramped imo. You don’t have to have air filters too, and heaters aren’t a guarantee that you won’t have parasites.

  89. Tayla November 16, 2016 at 1:04 am - Reply

    Oh also, I’m not sure if you can help me with this one but thought I should ask in case. I noticed that the two goldfish mentioned in my last comment (both approximately 1 year old Black Moors), have very cloudy eyes. I’m assuming it may be due to the poor condition they have been living in prior to me owning them. Will this clear up once put into a new tank with correct water PH, airation and filtration? Or is the damage already done?

    • Pure Goldfish
      Clementine November 27, 2016 at 7:30 pm - Reply

      It should heal up.

  90. Johnnythespecialgoldfish November 19, 2016 at 3:19 am - Reply

    Hi! I’m getting pretty concerned about my goldfish. All seven of ’em are single tails, and they’ve all grown so fast… they’re about 4-6 inches apiece. It’s getting way too crowded in their 25-gallon tank, and I’m trying to save up for a larger one (a pond is outta the question, unfortunately) – problem is, I’m kinda broke, and it’s gonna take a while to save up. When should I set as my deadline, and how large should the tank be? Help please, I want what’s best for them!

    • Pure Goldfish
      Clementine November 27, 2016 at 7:38 pm - Reply

      7 single tailed goldfish need 40 gallons each, so 7 x 40 = 280 gallons. Maybe a pond would be best. Based on their current size the sooner the better.

    • Elyse December 3, 2016 at 3:50 am - Reply

      I would try to find a solution ASAP.

      For the time being, you can get some of those large, plastic storage bins from walmart and put some of the fish in there.

      The youtube channel, Solid Gold Aquatics, also has some tips of
      other cheaper containers you can use for fish and how to set them up.

      Ultimately, you would probably need two 150 gallon tanks unless you can find someone reselling large custom tanks. You might be able to find someone that will give you tanks for free on sites like freecycle, but pretty much the lowwest you can expect to pay for a tank of that size with a stand is $150.

      You might want to see if you can rehome some of your fish. I think most pet stores will also take back some and resell them to people looking for pond fish.

  91. sadie November 22, 2016 at 4:26 am - Reply

    i am planning on getting a 15 gallon tank and i want a betta in it or a black moor goldfish which do u recomend and how many fish could i keep in it

    • Pure Goldfish
      Clementine November 27, 2016 at 7:44 pm - Reply

      1 goldfish would be fine.

  92. Stan November 23, 2016 at 6:23 pm - Reply

    I have a comet and I think it’s called a fan tale in a 20g. Have only just realized reading all the poss it’s prolly not enough. How big do I wanna go?
    Also, 6 weeks ago the fantale looked like it had a blood clot in one of its tales. I gave it something that turned the water blue for a day. Now it’s fine. Am I fish whisperer?

    • Pure Goldfish
      Clementine November 27, 2016 at 11:24 pm - Reply

      40 gallons would be best for a comet, a fantail is a different type of goldfish than a comet.

  93. Erin November 28, 2016 at 5:22 am - Reply

    Hi, in April I found a comet goldfish in an abandoned house I was cleaning for a friend. He was swimming in an inch of black water and gravel and had a wound on his side. He hadn’t eaten in at least three months and probably longer than that. I actually thought the tank was empty until I started pulling out some of the gravel and felt something brush against my hand. Needless to say I couldn’t leave him there but hadn’t planned to have a pet fish either.
    I have him in a 10 gallon tank now and know he will need bigger. He’s probably about a year old now (he apparently came from a carnival in the fall of 2015) I am not allowed to have any bigger than a 20 gallon in my apartment and won’t be moving from here for at least 9 months, that is when our lease expires.
    Do you think he will be okay in a 20 gallon with frequent water changes? Or should I rehome him? I plan on getting a 55 gallon kit once we buy a place. I feel an obligation to do the best for the little guy considering what a survivor he is.

    • Pure Goldfish
      Clementine November 30, 2016 at 7:39 pm - Reply

      He should be okay for a while with good care, but you will want to get him a bigger tank when you can 🙂

  94. Julia November 28, 2016 at 10:31 pm - Reply

    So I have 5 juvenile goldfish and a koi fish in a 37 gallon tank. (The koi is also juvenile) Is it ok that I expand it as they grow? Or will they need a big tank when they are small too? Thanks for you help!

    • Elyse December 3, 2016 at 4:09 am - Reply

      I believe goldfish grow most of their length in just a year. Considering that common goldfish can grow 12 inches or longer in good conditions, that tank will get crowded…FAST!
      While the rule of thumb for most fish is a gallon per inch, goldfish and koi are thick and messier. It would be cheaper and more practical just to get a large tank or pond that could fit them all as adult fish.

  95. Julia November 28, 2016 at 10:44 pm - Reply

    Also, I’m thinking of getting a pond. But I’m 10 and my parents probably won’t let that happen. But how much space of the yard would a pond take up? And how much would it cost to put it in and for all the filtration? Thanks! 🙂

  96. Julia November 28, 2016 at 10:45 pm - Reply

    And one more thing…. Is brine shrimp good for goldfish? I got some today and fed some to them and I want to make sure I’m not harming them 🙂

    • Pure Goldfish
      Clementine November 30, 2016 at 7:41 pm - Reply

      Brine shrimp is good 🙂 A bigger tank or pond is ideal for your fish. Koi are not indoor fish and need to be kept in ponds. Your parents would probably have to figure out how big of a pond they want and where it should go – they can be very expensive!

  97. fish lover December 14, 2016 at 8:08 am - Reply

    i have a 7.5 gallon tank, how many black moors can i have?

    • Pure Goldfish
      Clementine December 15, 2016 at 5:27 pm - Reply

      None, that’s too small! 🙂

  98. Matt December 15, 2016 at 4:50 pm - Reply

    I have 4 comet goldfish. Currently each in a 2.5 liter tank, I was wondering first if they would survive for two weeks in these tanks with the fish sitter. Also if I buy a 50gal tank for them would it support them and 4 aquatic snails?

    • Pure Goldfish
      Clementine December 15, 2016 at 7:27 pm - Reply

      In a tank that size, they might not survive that long with or without a sitter. 50 gallons is not enough for 4 comets, just one. Hope that helps 🙂

  99. Vicky December 16, 2016 at 4:34 am - Reply

    Loved your article 🙂 I have 20 gallon tank with 8 zebra danios. I wonder if a single oranda or plain red cap would fit in ? Please help. Also what is average adult size for red caps & will he outgrow this tank when fully grown ? I really love red caps but i dnt want to force him live his life in tiny space. 🙁

    • Pure Goldfish
      Clementine December 18, 2016 at 5:24 pm - Reply

      Thanks so much, Vicky!

      I wouldn’t mix the two; one goldfish for a 20 gallon tank is just right (with no other fish).

      Orandas grow 8″ plus 🙂 20 gallons is fine for him.

  100. Rosa December 17, 2016 at 12:31 am - Reply

    Hi there! I have a 24 gallon tank and I’m planning to put two fancy goldfish in there that I’m adopting from my friends 10 gallon tank (with the intention of upgrading them next year when I have the money).

    What size filter would you recommend? Also any advice on how best to integrate them into their new home?


    • Pure Goldfish
      Clementine December 18, 2016 at 5:25 pm - Reply

      If you have a filter already, use that until the new tank is cycled. Then you can get a new one. They have the ratings on the box.

  101. Sake December 20, 2016 at 1:37 am - Reply

    Hi! What tank size would you reccomend for one black moor and one ryukin? Thank you!

    • Pure Goldfish
      Clementine December 21, 2016 at 8:53 pm - Reply

      Ideally 30 gallons, though you could maybe get away with 25.

  102. israel December 26, 2016 at 9:01 pm - Reply

    what would you suggest for 6 commet gold fish (tank size)

    • Pure Goldfish
      Clementine December 28, 2016 at 4:40 am - Reply

      6 fish X 40 gallons each = 240 gallons. Maybe a pond 😉

  103. Emily January 2, 2017 at 11:06 pm - Reply

    If i have two common goldfish can i have a smallish bowl type tank rather than a large aquarium or which size do you recommend??

    • Pure Goldfish
      Clementine January 5, 2017 at 7:15 pm - Reply

      No, no bowls. Follow the aquarium size in the article 🙂

  104. Eli January 7, 2017 at 12:42 am - Reply

    Can I fit two fancies in a 37 gallon tall? I’m aware that a tall tank is not ideal.

    • Pure Goldfish
      Clementine January 13, 2017 at 6:43 pm - Reply

      They should be fine.

  105. Sherry January 14, 2017 at 2:49 am - Reply

    My daughter won 4 tiny feeder fish (im assuming). From her school party. We also have one from the previous year that has grown 1 to 2 in. The new ones are very tiny. I currently have them in a 10 gal. Tank. I have read that it’s to small. (Feeling guilty btw) lol I have an old tank, but it’s a tall one with a built in stand. Would that be ok. Don’t really have the room for a 100+ gl. Is it a myth that GF grow to the size of their tank? Thanks for all positive feedback.

    • Pure Goldfish
      Clementine January 22, 2017 at 10:05 pm - Reply

      Tall is fine, big is what is important. Yes that is a myth 🙂

  106. matt January 14, 2017 at 6:52 pm - Reply

    i have 4 common goldfish all about 5.5 in long how big of a fish tank do i need to suit theses fish

    • Pure Goldfish
      Clementine January 22, 2017 at 10:08 pm - Reply

      4 x 40 gallons each = 160 g

  107. Laura January 16, 2017 at 6:28 am - Reply

    I have a 50 gallon tank and 2 goldfish. One is about 8″ long and the other is 1.5 “. We can not keep the tank clean. We change the water and it looks better for a few days and is cloudy… really cloudy again in a few days. It’s becoming so much work. The fish are good, we just don’t know what to do. The biggest fish keeps getting bigger. We just can’t keep up. Need help!

    • Pure Goldfish
      Clementine January 22, 2017 at 10:10 pm - Reply

      Follow the tank maintenance schedule in our book and you will have way less work 🙂

  108. Stefan January 30, 2017 at 1:58 pm - Reply

    I have a 1.5 yr old common goldfish that is around 8″ in a 55 gallon tank. How big can it grow and can I add a new small goldfish to the tank?

  109. Jaime Alvarez January 30, 2017 at 9:16 pm - Reply

    I have a black moor, Ryukin, Orando, and a calico fantail how many gallons do you recommend

    • Pure Goldfish
      Clementine February 17, 2017 at 4:45 am - Reply

      4 x 20 so 80 gallons

  110. Rob February 13, 2017 at 11:17 am - Reply

    I have a 125 L fish tank. It’s home to 1 small single tailed goldfish. Is it too small? If so can it grow happy in the tank before I transfer to parents pond?

  111. Daniel February 13, 2017 at 10:31 pm - Reply

    I just got 4 baby comet goldfish in 1 gallon tank. Should I get a bigger tank for them?

    • Pure Goldfish
      Clementine February 17, 2017 at 4:55 am - Reply

      Yes!! 🙂

  112. mary February 19, 2017 at 7:20 pm - Reply

    i’m planning on buying two goldfish but i have no idea on how big of a tank i need to buy.I was wondering if you could tell me how big the tank should be and where is the best place to buy a tank

    • Pure Goldfish
      Clementine February 19, 2017 at 11:04 pm - Reply

      Depends on what kind of goldfish you get.

  113. Robert Perry February 25, 2017 at 1:30 am - Reply

    May be a dumb question, but would just one goldfish be ok in a 20 gallon, depending on the species?

    • Pure Goldfish
      Clementine March 7, 2017 at 4:48 pm - Reply

      A fancy would be perfect for that 🙂

  114. Dee February 25, 2017 at 2:29 am - Reply

    I want to get a Fluvial M-90 36 gal all in one (filter and pump are located inside a separated area in the tank) which has a cabinet plumbed with a drainage line with a open/close valve that empires into a bucket so you can do simple (frequent) water changes. This is considered a reef tank due to configuration (and pump etc design which can be upgraded) but the thing is it’s almost as big as a 50 gal tank in length and width dimensions just shorter. I don’t think hight is has important as elongated space to swim and it definitely would have a lot of surface area from oxygenation goes. I want to put 3 oranda’s in it and that’s it….what do you think….will this work?

    • Pure Goldfish
      Clementine March 7, 2017 at 4:49 pm - Reply

      With enough filtration, you might be okay.

  115. Lilly March 2, 2017 at 12:01 am - Reply

    I just got 2 goldfish yesterday and am keeping them in a bowl until I go get a bigger tank tomorrow. What is the smallest possible size you would recommend for 2 goldfish? (I think they are common)
    Thank You!!!

    • Pure Goldfish
      Clementine March 7, 2017 at 4:54 pm - Reply

      80 gallons for 2 slim bodied fish 🙂

  116. Jessica March 6, 2017 at 7:16 pm - Reply

    I have a 3 year old comet goldfish. He is currently living in a 36 gallon bow front tank with no other roommates. Do I need to eventually get a bigger tank or will he be fine in that one as long as I dont add to it?

    • Pure Goldfish
      Clementine March 7, 2017 at 4:57 pm - Reply

      That’s pretty good.

  117. Claire March 8, 2017 at 10:18 am - Reply

    I have 1 black moor and 1 fantail in a 125 litre tank. Is this ok? Soneone telling me I need 150 litres

  118. Mir March 11, 2017 at 6:00 am - Reply

    My comet is 3 inches. I have him in a 10 gallon and I keep the water parameters pretty good. I do plan to upgrade. My question is…will him being in the 10 gallon stunt his growth? Or will he just outgrow the tanks?

    • Pure Goldfish
      Clementine March 12, 2017 at 10:24 pm - Reply

      Depends on how long you keep him there.

  119. Diana March 12, 2017 at 1:22 pm - Reply

    I have what I believe is a common goldfish (he was won at a fair) He is in a 37-gallon tank and is aporoximately 5 years old. Is it o.k. to add another fish? I worry the fish is lonely but do not want him to get stressed.

  120. Rosie March 12, 2017 at 4:08 pm - Reply

    I just bought 5 panda moor goldfish. They are about an inch or so in length now. Looking to the future, what size tank would be enough for them at adult size? I also considered a pond, but wanted to know how many gallons. Thanks.

    • Pure Goldfish
      Clementine March 12, 2017 at 10:25 pm - Reply

      At least 50 gallons

  121. Kong March 17, 2017 at 9:18 am - Reply

    I just bought my 35gallon tank today and I have 2 oranda about to 3 or 4 inch. Is it have enough space for them to swim around? Or should I get 1 more oranda?, because I want one more goldfish to go with it.

  122. Camilla March 19, 2017 at 2:24 pm - Reply

    I am buying two goldfish. What size tank should I get in litres. Would like a tank which sits on a table rather than a stand. Any suggestions of where to buy too? I am UK based

  123. Anthony March 20, 2017 at 2:45 am - Reply

    can 1 goldfish about 4 cm long live long in a Size 16x9x9cm tank?

    • Freya May 5, 2017 at 6:34 pm - Reply

      No, you need something much bigger with good filtration.

  124. aniccolai March 20, 2017 at 9:34 pm - Reply

    I have 2 comet gold fish and am keeping them in a tank for beta fish(the smaller one is a little less than 3 inches). Is this ok?

    • Pure Goldfish
      Clementine March 26, 2017 at 8:50 pm - Reply

      No :/

  125. Tess March 22, 2017 at 12:40 am - Reply

    I was thinking about getting a fantail goldfish, I have a 10 gallon aquarium. Would this be ok until it is larger maybe next year and I could upgrade to a 20 gallon? Or would it’s waste be impossible to keep up with? Also do you recommend gravel or sand or no substrate? Thanks!

    • Pure Goldfish
      Clementine March 26, 2017 at 8:51 pm - Reply

      I think that 10 g would be fine.

  126. Emad Moussa March 22, 2017 at 9:07 pm - Reply

    Hi, I’ve got a 300 litres tank (80gl), with a 2in black moor in it, and already bought 5 medium to big fancy lionhead goldfish to add. I also would like a couple of dojo loaches. Based on what I know, it should be the max of what I can fit into this tank. Any thoughts?

  127. Adna March 24, 2017 at 9:33 pm - Reply

    Will a 10 gallon tank be okay for just a year for 1 fantail? I’m a student but I do plan on saving for a bigger tank, will a 20 gallon be ok? Obviously I will cycle the tank and have a filter and do weekly water chances of 25 to 50% depending on ammonia,nitrite and nitrate levels. Will 1 goldfish be stressed if it lives alone?

  128. Rebekah March 25, 2017 at 7:42 pm - Reply

    Hi, we have a 28L tank, is that big enough for two Oranda’s?

    • Freya May 23, 2017 at 6:10 am - Reply

      No, you need at least 120l / 30 gallons

  129. Aaron March 25, 2017 at 11:04 pm - Reply

    My grandmother kept a Feeder goldfish alive in a Fishbowl for 7 years I know of … So it can be done … is it good or bad bot for Me to say …

    • Freya May 5, 2017 at 6:37 pm - Reply

      Just because you can keep it alive doesn’t mean it’s living well, it would need something much bigger and good filtration to thrive

  130. Haim March 26, 2017 at 4:36 pm - Reply

    I’m getting a 6 inch fancy Oranda goldfish and I have a 20 gallon tank with no fish in it. Can I put him in or it’s too small?

  131. Tal March 26, 2017 at 8:10 pm - Reply

    I have 1 comet goldfish currently he is in a bowl. Should I upgrade to a bigger just for 1 gold fish?
    And what is a good size for a tank for him?

    • Freya May 5, 2017 at 6:39 pm - Reply

      Yes, definitely it’ll need at least 50 gallons or its growth will be stunted, you need a large tank and very good filtration.

  132. Sam April 5, 2017 at 10:04 am - Reply

    Can I keep two goldfish in a 10 gallon tank? Which goldfish would be better for this space, normal or fancy?

    • Pure Goldfish
      Clementine April 16, 2017 at 10:10 pm - Reply

      No, just one fancy

  133. Claire April 8, 2017 at 10:31 am - Reply

    I have 1 black moor in a 125 litre tank? Can I add a Calico Fantail and house them both for life in this. Someone telling me I need 150 litres

  134. Sarah Main April 10, 2017 at 4:10 am - Reply

    Would a 30 gallon tank be large enough for two black moor goldfish?

    • Pure Goldfish
      Clementine April 16, 2017 at 10:15 pm - Reply


  135. Joseph April 14, 2017 at 12:39 am - Reply

    I have a 75 gallon tank with 4 baby comet goldfish and an algae water in it. Will they be fine in that or will I need to upgrade?

    • Pure Goldfish
      Clementine April 16, 2017 at 10:33 pm - Reply

      Take out the algae eater and yes you will need to upgrade

  136. Ana April 17, 2017 at 8:52 am - Reply

    I got 4 small feeder fish (I think they are feeder but I’m not sure to be honest) at a party. I bought the 3.7 gallon imagitarium aquarium. Is this enough space? I live in a college dorm and I’m not allowed to have anything bigger than 5 gallons…

    • Pure Goldfish
      Clementine April 22, 2017 at 7:30 pm - Reply

      A betta would be better for that space

    • Freya May 5, 2017 at 6:41 pm - Reply

      I agree, please return the goldfish if you can this is way too small for them.

  137. Graham May 4, 2017 at 8:08 pm - Reply

    I have a comet goldfish that is less than an inch long. How long can I keep it in a 3.5 gallon tank?

    • Freya May 23, 2017 at 6:12 am - Reply

      Maybe a week? You need to upgrade it as soon as possible.

  138. Freya May 5, 2017 at 6:46 pm - Reply

    Hi, I was wondering if I could keep 2 oranda in a 120l tank? Thanks

    • Freya May 23, 2017 at 6:14 am - Reply

      I have a 160l now (40 gallons) I was going to get two oranda goldfish but I wasn’t sure if I should get 3 instead, thanks. It has not been set up or cycled yet but that will happen before I get them.

  139. jeremy May 14, 2017 at 5:17 pm - Reply

    I have goldfish in a pond but I want to bring them in for the winter. What size tank do I need I have one shubukin and two regular gold fish. Tganks

  140. Noreli May 17, 2017 at 10:32 pm - Reply

    Hi I have two common gold fish. What would be a good size tank for me to get?¿

    • Pure Goldfish
      Clementine May 19, 2017 at 5:06 pm - Reply

      80 gallons 🙂

  141. Lydia May 19, 2017 at 5:41 pm - Reply

    I am planning on getting 1 large comet goldfish from PetSmart. Would a 29 gallon tank be okay?

    • Pure Goldfish
      Clementine May 20, 2017 at 4:39 pm - Reply

      For a while it will be.

  142. Mandy May 22, 2017 at 4:30 pm - Reply

    I had one Black Moor in a 10 gallon because I was told he’d be okay. He was small and I did water changes three times a week. My happy, healthy fish just moved into a 20 gallon long with an AquaClear 50 and I’m so glad I did this for him. I don’t have the space for a larger tank and as much as I’d love another fish I know he’s better off by himself.

    • Pure Goldfish
      Clementine May 23, 2017 at 7:44 pm - Reply

      That’s great to hear, Mandy! The more space the better.

  143. Leeper May 22, 2017 at 8:10 pm - Reply

    I have 3 fantail goldfish. Will they be ok in a 29 gallon tank?

  144. Leeper May 22, 2017 at 8:19 pm - Reply

    After reading more….it looks like I need at least a 40 gallon. Is that right?

    • Pure Goldfish
      Clementine May 23, 2017 at 7:44 pm - Reply

      A 40 gallon would be best. But you could make the 29 gallon work if need be.

  145. Bob June 5, 2017 at 1:22 am - Reply

    Hi, I just got a common goldfish. What kind of tank should i get?

    • Pure Goldfish
      Clementine June 17, 2017 at 11:08 pm - Reply

      40 gallons 🙂

  146. Gino June 11, 2017 at 3:43 pm - Reply

    What’s the best female male ratio for fancies? I want 4 fancies so should I do 2 and 2 or maybe 1 male 3 females? What do you think? Also bare bottom or sand or soil substrate? One last question how many water changes can I do in a week? I would love to do one 25% a day..is that too much what’s the best way/amount? Thanks!

    • Pure Goldfish
      Clementine June 17, 2017 at 11:01 pm - Reply

      If you want to avoid spawning strife, go for all one sex. Bare bottom. Go for those water changes 🙂

  147. Annette June 19, 2017 at 7:05 pm - Reply

    Ok, I have 2 commons in a 40 gallon breeder tank so space wise the dimensions are different than long thin. This works well for the amount of space my house will allow. Plus they have good filtration and good diet. They’ve never been sick and when I ran this sz thing past a pet shop he said the breeder will suffice. Maybe not the case with a regular 40 gallon tank. I’ve become fond of my 2 commons, so I’m not keen on trading them for 2 fancies. Your thought?

  148. Annette June 19, 2017 at 7:18 pm - Reply

    Ok, I’m getting different info from you than the pet shop. I have 2 commons in a 40 gallon tank. But because it’s a breeder tank the dimensions are different ie; the aquatics person said their environment is better than longer thinner. I hope he’s right because my 2 fish have never been sick and I keep up on water changes, good filtration and healthy diet. PIus the tank sz works well in our small house.

    I’ve become fond of them and really don’t want to trade them for 2 fancies if I can avoid it. I’ve had them for 3 yrs, they are now I’m guessing close to 4 inches.

    Your thoughts?

    • Pure Goldfish
      Clementine June 24, 2017 at 9:24 pm - Reply

      Ok, I’m getting different info from you than the pet shop.

      I’m not surprised. 🙂

      Frankly I’d just get another tank, and keep one in your current one and one in the other. That way you can enjoy them both 🙂

  149. Georgina June 20, 2017 at 1:34 pm - Reply

    I have two fancy goldfish in a 30 litre tank they are small at the moment what sort of size would I need when they get bigger

    • Pure Goldfish
      Clementine June 24, 2017 at 9:20 pm - Reply

      More than double the size 🙂

  150. jithin June 22, 2017 at 10:13 am - Reply

    i have 8 goldfish in 100 gallon,size between 3inch and 5 inch,is it ok?

    • Pure Goldfish
      Clementine June 24, 2017 at 9:17 pm - Reply

      Depends on what type they are.

  151. Diana June 22, 2017 at 6:33 pm - Reply

    I have 1 goldfish about 1.5 inches long. Not sure the breed was given to my grandson at a fair. He/she is in a 10 gallon tank. How long before he needs bigger tank?

    • Pure Goldfish
      Clementine June 24, 2017 at 9:16 pm - Reply

      If it is a single tailed goldfish, 40 gallons. You can best tell by looking above.

  152. Silvet July 5, 2017 at 3:17 pm - Reply

    How much gallon does a small common goldfish need?

    Rating: 5
    • Pure Goldfish
      Clementine July 7, 2017 at 10:56 pm - Reply

      40 gallons 🙂 They grow big.

  153. Misty July 26, 2017 at 3:47 am - Reply

    I have a question how many gallons should a tank be for 4 oranda goldfish(adults)?

    Rating: 5
    • Pure Goldfish
      Clementine July 30, 2017 at 8:11 pm - Reply

      I’d go with anywhere from 40 (minimum) to 80+ gallons 🙂

  154. Fernando Hernandez July 26, 2017 at 4:37 am - Reply

    How many gallons do I need for killer whale

    Rating: 4.5
    • Morgan August 8, 2017 at 4:06 am - Reply

      187,000,000,000,000,000,000 Gallons, Well that\\\\\\\’s what I keep my killer whale in named Hank. The tank is about the same size as the Pacific Ocean.

  155. Munko July 31, 2017 at 8:40 pm - Reply

    I need help my black broidtail goldfish is just lying down on the bottom of the tank rarely swims around

    Rating: 5
    • Pure Goldfish
      Clementine August 9, 2017 at 8:32 pm - Reply

      Have you tried testing the water, Munko?

  156. Edmy July 31, 2017 at 10:22 pm - Reply

    I have 16 single tailed goldfish…….. 2 Algae fish and an American Dwarf Frog, what tank do you recommend me for all these? My mom went over board when she got a fish tank for free

    Rating: 5
  157. Edmy July 31, 2017 at 10:44 pm - Reply

    I have 16 Comet Goldfish, 2 algae fish and 1 dwarf frog, what gallon tank do you recommend?

    Rating: 5
    • Pure Goldfish
      Clementine August 9, 2017 at 8:31 pm - Reply

      16 comets? That’d be 40 gallons each so 640 gallons. A pond would be ideal.

  158. Tim August 4, 2017 at 12:06 am - Reply

    Currently my son has a ryukin, an oranda and a fantail ( about 1.5 inches each ) in a planted 30 gallon aquarium. I am planning on upgraded to a larger tank soon. Would a 55 or 75 gallon be big enough for all three fish when they are adults or should I try to find something bigger?

    Rating: 5
    • Pure Goldfish
      Clementine August 9, 2017 at 8:22 pm - Reply

      The 55 gallon should be fine, but if you have the room you can always go for a bigger tank 🙂

  159. roni August 9, 2017 at 6:10 pm - Reply

    How many gallons do I need for 6 goldfish and 2 Black mollies ???

    Rating: 4
  160. FishBabies August 15, 2017 at 2:13 am - Reply

    I have 3 comet goldfish (those are the tiny feeder fish at petco, right?), what size tank should I get?

    Rating: 5
    • Pure Goldfish
      Clementine August 19, 2017 at 9:30 pm - Reply

      3 comets would be a 120 gallon. Sounds like a huge tank for small fish but they grow to be over 12″ long each! You may want a pond 😉

  161. Georgia August 16, 2017 at 11:08 am - Reply

    I have a 15g long tank and plan to keep one small fancy in it with plenty of water changes and monitoring will this be ok , plenty of people have said this will be perfect but wanted to check 🙂

    Rating: 5
    • Pure Goldfish
      Clementine August 19, 2017 at 9:20 pm - Reply

      Yeah that’s just fine 🙂

  162. karmen August 22, 2017 at 12:42 am - Reply

    My son came home from the fair last night with 4 small goldfish in a small beta tank!! I’m wondering how much time we have to get a bigger tank before they get amonia poisoning! 🙁

    Rating: 5
    • Pure Goldfish
      Clementine August 22, 2017 at 5:58 pm - Reply

      Definitely act as fast as you can, and do lots of water changes initially!

  163. mucho August 26, 2017 at 1:57 am - Reply

    how big of a tank would i need for 2 common goldfish?

    Rating: 5
    • Pure Goldfish
      Clementine August 27, 2017 at 11:15 pm - Reply

      40 gallons apiece, so 80 gallons.

  164. Sidney August 31, 2017 at 5:46 pm - Reply

    I have 2 5″ saracah (sp.) In a 55 is that ok?

    Rating: 5
    • Pure Goldfish
      Clementine September 2, 2017 at 11:46 pm - Reply

      An 80 gallon would be better, or even a pond 🙂

  165. Egor September 10, 2017 at 12:57 pm - Reply

    I have a 2.5 inch comet in a 2.5 gallon. On New years Im getting a 30 gallon. Will my fish survive that long?

    Rating: 5
    • Pure Goldfish
      Clementine September 10, 2017 at 11:01 pm - Reply

      It depends on a lot of factors, but if the water stays perfect then they should.

  166. Tata September 13, 2017 at 5:49 pm - Reply

    what size of a tank should I have for my pond fish to bring indoors for the winter? Ive got 3 very large ones and the rest are 2yrs old and also babys

    Rating: 4.5
    • Pure Goldfish
      Clementine September 24, 2017 at 11:36 pm - Reply

      It depends on how many you have and what kind. 🙂

  167. mvenatta September 20, 2017 at 10:01 am - Reply

    I am getting a 75g aquarium and want to know how many fancy goldfish would be appropriate for that tank at full grown size. I want a common pearlscale and also considered black moor, oranda and veil tail as possible tank mates. What would work best (2,3,4)? I don\’t want the tank to become to congested with fish when full sized.

    • Pure Goldfish
      Clementine September 24, 2017 at 11:20 pm - Reply

      4 fish would be a good number 🙂 Maybe 5 max if you have good filtration.

  168. Sillibee October 13, 2017 at 12:31 am - Reply

    Would 10 gallons be ok for two small Comet Goldfish?

    Rating: 4
    • Pure Goldfish
      Clementine October 22, 2017 at 11:07 pm - Reply

      Unfortunately, no – not big enough for one 🙁

  169. Brianna October 17, 2017 at 1:47 am - Reply

    I have a 60 gallon tank, and I was planning on having 5 fancy goldfish in it. My question is is two air stones okay for it ? Do I need more ?

    Rating: 3.5
    • Pure Goldfish
      Clementine October 22, 2017 at 10:49 pm - Reply

      If you have a good quality filter, you don’t usually need airstones 🙂

  170. Nannywahl October 17, 2017 at 3:34 am - Reply

    I ave a waterfall pond that is 1 foot deep and 42 inches diameter. I have 5 goldfish in it and they are thriving. Trouble is, Indiana winters can get very cold with lots of snow. I thought maybe putting them in a tank inside, but I don’t know if the size would be feasible for my small home. Would they survive in the pond?

    Rating: 3.5
    • Pure Goldfish
      Clementine October 22, 2017 at 10:49 pm - Reply

      What kind of goldfish do you have, Nannywahl? I think the pond would need to be deeper than 1 foot not to freeze solid in a very cold climate…

  171. Giovanni Carlo October 30, 2017 at 12:07 am - Reply

    This is most common question goldfish keepers asking that is why most of the keepers wondering why their goldfish did not grow because they lack enough space

    Rating: 5
    • Pure Goldfish
      Clementine November 4, 2017 at 10:59 pm - Reply

      I definitely agree with that, Giovanni!

  172. rJ Nadeau November 1, 2017 at 3:57 pm - Reply

    I had read that you need 20 gallons per fish… I have 2 Single tale comets.. in a 40 gallon tank with a super filter big enough to clean a 100 gallon tank (350 gals per hour)…Ive had them over 1 year and they are both about 8″… they seem happy.. will they get bigger in tis environment ? Do I need truly need to upgrade to a larger tank? …. I purchased this size because I believed this was what would need…. My 2 comets appear to get along well and happy… ps Loving Gold fish I’ve had similar experiences with Gold Fish deaths.. its very disturbing… well hope you see comment looking forward to any suggestions..

    Rating: 5
    • Pure Goldfish
      Clementine November 4, 2017 at 11:01 pm - Reply

      It depends on your water changes.

  173. Cc November 5, 2017 at 6:00 am - Reply

    I think my 2 gold fish is a common or a comet and I have 1 mystery snail all in a 10 gal tank I haven’t really had them long but I need advice bc this is my first time having them. I’m only 17 and I’m trying my best to take care of all of them. I got them all from Walmart and I’ve seen you say they need bigger but my family is really right on money so how long can they stay in the 10 gal bc I make sure I clean it and wash the rocks and put tetra safe in the water like recommended. And I’m also wondering if it’s good to have my mystery snail in with the gold fish because he wasn’t coming out of his shell, and didn’t want to move. So I thought he was dead until I put him in a bowl full of water from the tank and put some of the rocks in it and now he’s fine and all. But when he was in the tank before I put him in the bowl tonight, it looked like the goldfish were trying to stack him or something… I’m trying my best and I’ve been researching so I know how to care for them and your the only thing I’ve found that has cleared some stuff up for me…

    Rating: 4
    • Pure Goldfish
      Clementine November 12, 2017 at 7:05 pm - Reply

      If you are looking to save money, a Tupperware bin is a good option 🙂 You may also want to make sure your snail has plenty of hiding places if the goldfish are picking on him… a bigger tank usually helps with that too.

  174. Nicole November 12, 2017 at 7:08 pm - Reply

    Can you have 1 regular goldfish and two fancy goldfish in a 10 gallon tank?

    Rating: 4.5
    • Pure Goldfish
      Clementine November 12, 2017 at 7:29 pm - Reply

      No, that is too many 🙁

  175. Celemtine November 12, 2017 at 7:23 pm - Reply