aquarium castle

Are you looking for something fun and exciting to add to your fish tank? Aquarium castles are a fun addition that come in a wide variety of sizes and finding the right one will leave you and your fish feeling like royalty. But there are a lot of fish tank castles out there! It can be hard to narrow down all the products to find the one that not only suits your aesthetic but also creates a more comfortable and enriching environment for your fish.

These reviews will help you narrow down the right aquarium castle to fit your fish tank, regardless of if you’re looking for a specific color scheme, size, or design.


A Quick Comparison of Our Favorites

Image Product Details
Best Overall
Winner
Penn-Plax Castle Aquarium Decoration Penn-Plax Castle Aquarium Decoration
  • Made from sturdy resin
  • Realistic aged look
  • Great ornament for tall, narrow tanks
  • Best Value
    Second place
    kathson Aquarium Decoration kathson Aquarium Decoration
  • Eco-friendly resin
  • Designed not to fade
  • Multiple entrances into cave space
  • Premium Choice
    Third place
    Penn Plax Enchanted Castles Aquarium Decoration Penn Plax Enchanted Castles Aquarium Decoration
  • Made from high-quality resin
  • Safe for freshwater and saltwater tanks
  • Realistic painting
  • Miracliy Aquarium Decorations Castle Miracliy Aquarium Decorations Castle
  • Non-toxic resin
  • Provides multiple swim-through areas for fish
  • Brightly colored
  • Penn-Plax Wizard’s Castle Aquarium Decoration Penn-Plax Wizard’s Castle Aquarium Decoration
  • Hand-painted resin
  • Multiple openings of varying size
  • Sized for tanks from 10-50 gallons
  • The 10 Best Aquarium Castle Decorations for Your Fish Tank – Reviews 2021

    1. Penn-Plax Castle Aquarium Decoration – Best OverallPenn-Plax Castle Aquarium Decoration

    The best overall aquarium castle decoration we selected is the Penn-Plax Castle Aquarium Decoration. This castle is made from sturdy resin and is safe for use in freshwater and saltwater tanks.

    This aquarium castle features a large, multi-spire castle seated on a cavernous rock mountain. There is a bridge approaching the base of the castle and painted water flows beneath it. Behind the bridge is a hidden cave, perfect for shy or nocturnal fish. Both the castle and the mountain have openings for fish of all sizes to enjoy. The Penn-Plax castle is painted to look realistic, so the brown castle and its blue spires are dotted with the colors of moss and lichen growth, and the mountain is as well.

    This aquarium castle is 14.5 inches tall at the tip of its highest spire, 12.8 inches long, and only 8 inches deep, making this an excellent piece of décor for a tall, narrow tank like a 55-gallon tall. Some parts of this castle may have rough edges that will require sending before use with long-tailed fish like fancy goldfish and bettas.

    Pros
    • Made from sturdy resin
    • Safe for freshwater and saltwater tanks
    • Realistic aged look with painted lichens and mosses
    • Offers multiple hiding places of varying sizes
    • Great ornament for tall, narrow tanks
    • Creates an aesthetically pleasing tank centerpiece
    Cons
    • May be too tall or long for small tanks
    • Rough edges may need to be smoothed

    2. kathson Aquarium Decoration – Best Valuekathson Aquarium Decoration Big Castle

    The best aquarium castle decoration for your fish tank for the money is the kathson Aquarium Decoration. It is made from eco-friendly resin and is designed not to fade over time.

    This ornament is 7.87 inches long, 3.14 inches wide, and 5.51 inches tall, making this a great choice for a 10 or 20-gallon tank. It may even fit into a smaller tank depending on the tank’s measurements. Its small size may cause it to look out of place in a larger aquarium. This aquarium castle is designed to look like the ruins of a castle with crumbling towers and plants taking over. The front stands out with pops of green plants painted onto the castle while the back looks like dark castle ruins seated on stone. This ornament is mostly hollow with multiple entrances into the cave space.

    Some parts of this ornament are rough and may need to be sanded down for long-tailed fish but sanding it may lead to the paint peeling over time. The sink weight can get knocked out of this castle. If this happens, it will need to be held down with gravel or heavy objects to prevent floating.

    Pros
    • Eco-friendly resin
    • Designed not to fade
    • Multiple entrances into cave space
    • Small size means it looks great in tanks 20 gallons or less
    • Aged ruins with detailed plants painted on it
    Cons
    • Rough edges may need to be smoothed, causing paint to peel over time
    • Sink weight may get knocked out
    • Too small for large tanks

    3. Penn Plax Enchanted Castles Aquarium Decoration – Premium ChoicePenn Plax Enchanted Castles Aquarium Decoration

    The premium pick for the best aquarium castle for your fish tank is the Penn Plax Enchanted Castles Aquarium Décor. This castle is made from high-quality resin and is safe for freshwater and saltwater tanks. It’s available in two sizes and matches Penn Plax décor.

    This castle is made to look cozy and homey. It features a hilly rock base with the castle on top. The castle has two towers connected by small, house-like castle buildings. The painting creates a sense of realism but is enjoyable for children and adults alike. There are mosses painted onto the rocks, but the castle itself features few signs of aging. The blue roofs and tan towers contrast well with the off-white on the central buildings. There are multiple openings into one large central cave.

    The smaller size castle is 6 inches tall and 3.5 inches wide, while the larger size is 8 inches tall and 5 inches wide. This may not fit larger fish but makes a great accent in medium tanks and will work for small to medium-sized fish. Some of the edges may require sanding to remove rough points that may scrape fish.

    Pros
    • Made from high-quality resin
    • Safe for freshwater and saltwater tanks
    • Realistic painting
    • Available in two sizes
    • Matches other décor from Penn Plax
    • Large internal castle with multiple openings
    Cons
    • Too tall for most small tanks
    • Rough edges may need to be smoothed
    • Premium price

    4. Miracliy Aquarium Decorations CastleMiracliy Aquarium Decorations Castle, Aquarium

    The Miracliy Aquarium Decorations Castle is a bright-colored option for a castle for your fish tank. This castle is made from non-toxic, sturdy resin.

    This castle is designed to look like a castle with multiple spires seated on top of a mountain. Both the mountain and the castle itself create open swim-through areas, but there are no hide caves in this castle. There is a small stream running below a raised part of the castle and features a small footbridge connected to a path that treks up the mountain to the castle. The Miracliy castle is lichen-spotted light blue with dark blue roofs on the spires. The mountain is bright pink and black with accents of green grass and moss. The colors of this castle are brought out best under blue or purple light.

    It is 10 inches tall, 9.4 inches long, and only 3.7 inches deep, so it’s a great option for medium or large-sized tanks but will likely not fit well in most tanks under 20 gallons. This product is also available in a darker color scheme of browns and greys.

    Pros
    • Non-toxic resin
    • Realistic aged look with painted lichens and grasses
    • Provides multiple swim-through areas for fish
    • Brightly colored
    • Creates an aesthetically pleasing tank centerpiece
    Cons
    • Too large for small tanks
    • Best viewed under blue or purple lighting
    • Does not have caves

    5. Penn-Plax Wizard’s Castle Aquarium DecorationPenn-Plax Wizard’s Castle Aquarium Decoration

    The Penn-Plax Wizard’s Castle is made of hand-painted resin and is safe for freshwater and saltwater tanks. It is painted on each side, so it can face any direction you prefer.

    This castle is painted with usually bright colors, like yellow, pink, and green, in a way that makes the colors understated. This gives the castle a realistic appearance instead of cartoonish. The castle itself has multiple blue-roofed spires and towers and sits on top of a brown and grey rocky hill. This product has multiple cave openings that all connect to one large interior cave. There are also some open swim-through windows.

    This castle measures 8 inches by 6.2 inches by 10.2 inches and is recommended for tanks from 10-50 gallons. The holes are small, though, so this product is best for small fish like tetras and invertebrates like shrimp. The upper parts of the cave that extend into the hollow part of the castle get very small, so it possible for fish to become stuck.

    Pros
    • Hand-painted resin
    • Safe for freshwater and saltwater tanks
    • Realistic aged look with understated paint colors
    • Multiple openings of varying size
    • Sized for tanks from 10-50 gallons
    • Good option for small fish and invertebrates
    Cons
    • Too large for small tanks
    • Holes are too small for many types of fish
    • Interior parts are small enough for some fish to get stuck

    6. Penn Plax RR693 Medieval Castle of GermanyPen Plax RR693 Medieval Castle of Germany Aquarium Ornament

    The Penn Plax RR693 Medieval Castle of Germany is made of high-quality resin and is safe for freshwater and saltwater tanks.

    This castle is extremely cute, featuring a soft color-palette that creates a fairy tale image. This castle is designed in standard medieval fashion with towers and spires. The castle itself is painted in soft blues and greys and is covered in realistic creeping vines and small flowers. There are swim-throughs and multiple openings into a central cave.

    This castle is listed as “small” but measures 8 inches long by 10 inches wide by 11 inches tall, so it is best suited in tall medium and large tanks. It is too big for most small tanks. The cave entrances and cave itself are suitable for small and medium-sized fish. This castle may have some rough edges that will need to be softened.

    Pros
    • Made from high-quality resin
    • Safe for freshwater and saltwater tanks
    • Fairy tale appearance
    • Unique paint job
    • Multiple openings into a central cave
    Cons
    • Too large for small tanks
    • Entrances are too small for large fish
    • Rough edges may need to be smoothed
    • Advertised as “small” but measures more like a medium ornament

    7. Blue Ribbon Exotics Environments CastleBlue Ribbon Exotic Environments Castle

    Blue Ribbon Exotics Environments Castle is made from non-toxic materials. It is safe for freshwater and saltwater tanks.

    This castle is perfectly suited for a child’s princess-themed tank, with its bright pink, purple, green, and gold colors, purple gemstone, and heart-shaped cave entrance. This castle is also available in a larger, dark-colored version featuring a gargoyle and harder features.

    This castle only has one entrance to the cave and does not have any swim-throughs. It is small, only 3.75 inches long by 2.75 inches wide by 5 inches tall, so it’s a perfect fit for small tanks 10 gallons and below. The paint on this product may begin to peel over time and some models have difficulty sinking, so may need to be weighed down.

    Pros
    • Made from non-toxic materials
    • Safe for freshwater and saltwater tanks
    • Available in princess and gargoyle themes
    • Bright paint job with gemstone
    • Unique heart-shaped cave entrance
    Cons
    • Too small for medium and large tanks
    • Entrance is only large enough for very small fish and invertebrates
    • Pain may peel over time
    • May have difficulty sinking and need to be weighed down

    8. Firestar Aquarium Ornament CastleAquarium Ornament Castle Hideout Aquarium Decorations

    The Firestar Aquarium Ornament Castle is made from resin and painted with eco-friendly paint. It is non-toxic and safe for freshwater and saltwater tanks.

    This ornament is designed to look like a crumbling castle seated on a raised stone base. It is painted primarily in shades of brown with grey and white in the stones. There are some creeping vines and grasses painted onto it and it features built-in plastic plants. This castle is decorated on all four sides, making it viewable from all angles. It has multiple openings that lead into two interior caves, one on each side of a raised footbridge that functions as a swim-through.

    This measures 9.6 inches by 5.3 inches by 7.54 inches, making it a great fit for medium or long small tanks. This castle is too small for most fish except small fish and invertebrates. The plastic plants are difficult to remove if preferred and the resin can be easily cracked if handled too roughly. Unfortunately, plastic plants are not preferred as they can injure some fish.

    Pros
    • Eco-friendly paint
    • Safe for freshwater and saltwater tanks
    • Realistic aged look with painted on and plastic plants
    • Two interior caves and a swim-through
    • Fits medium and some small tanks
    Cons
    • Plastic plants are built-in and difficult to remove
    • Plastic plants can cause injury to some fish
    • Too small for large tanks
    • Too small for most fish
    • Resin may crack with rough handling
    • Paint inside of caves may begin to flake

    9. M2cbridge Aquarium Decor CastleM2cbridge Aquarium Decor Castle Fish Tank Decoration

    The M2cbridge Aquarium Décor Castle is made of eco-friendly, non-toxic resin and is safe for freshwater and saltwater tanks. It’s designed to be stable, so tipping over in your tank shouldn’t be a problem.

    This castle has multiple spires of differing heights with brick and roof shingle detailing. The castle sits on a grassy hill and a spiraling walkway. There is a small swim-through arch and two cave entrances into a single cave. One entrance is in the largest tower of the castle and the other is behind the castle in one of the smaller sets of spires.

    This castle measures 6.5 inches by 4.5 inches by 6.3 inches, making it ideal for small tanks. The small overall size and small entrances make it too small for most fish, but it could be a great size for very small fish and invertebrates.

    Pros
    • Made from eco-friendly resin
    • Safe for freshwater and saltwater tanks
    • Designed with stability in mind
    Cons
    • Too small for tanks over 10 gallons
    • Entrances are too small for most fish
    • Painting is less detailed than other products
    • Swim-through archway is very small and most fish will not fit

    10. PIVBY Castles Aquarium OrnamentPIVBY Castles Aquarium Ornament Resin Mythical Magic Castles

    The PIVBY Castles Aquarium Ornament is made of sturdy, non-toxic resin. It is safe for freshwater and saltwater tanks. It’s made to be bottom-heavy to sit flat in your tank.

    This product features two small castles connected by a bridge. Each castle has a swim-through hole underneath and the bridge has three small swim-through arches. The spires on this castle are somewhat randomly shaped and the paint is imperfect and glossy. This castle does not have hideaway caves, only swim-throughs.

    This product is 6.3 inches long by 1.7 inches wide x 4.9 inches tall, so this castle will work best in tanks less than 10 gallons. The paint on this castle tends to flake, especially after being underwater for a while.

    Pros
    • Made from sturdy, non-toxic resin
    • Bottom-heavy to sit flat
    • Safe for freshwater and saltwater tanks
    Cons
    • No internal caves
    • Swim-throughs are too small for many fish
    • Too small for medium and large tanks
    • Paint is imperfect and flakes over time

    Buyer’s Guide

    How to Choose the Right Aquarium Castle for Your Fish Tank:
    • Take the size of your tank into account. Measure it if you have to, including measurements of the height of the tank. Purchasing a tank ornament that won’t fit into your tank is not only frustrating but time-consuming and can be costly if you end up unable to return the product for one reason or another.
    • What type of fish and invertebrates do you have? Caves and hides are excellent for many types of fish, but some fish will not get any use out of them and it may end up being an ornament that just takes up swimming space without enriching the environment of your tank. Some fish will prefer swim-throughs versus caves, like tetras and guppies, while others will prefer caves, like nocturnal and shy fish and invertebrates like Plecostomus and bamboo shrimp.
    • Consider the aesthetic you want for your tank. If you’re interested in making your tank look like ancient ruins, then a fully intact, brightly colored castle won’t be a good fit for your tank. If you’re going for a princess or mermaid theme, then something with brighter colors and more of a childlike or fairy tale feel will be perfect.
    • Think about how much use you think you’ll get out of the product. If you like to change things up in your fish tank every year, then purchasing a more expensive product may not be beneficial to you. If you want to set up your tank and leave it be, then purchasing a higher quality product is best for you. Higher quality products are less prone to chipping and peeling paint, but even cheaper or lower quality products should last you months to years before needing replacement.
    Safety Considerations for Aquarium Castles for Your Fish Tank:
    • If you have long-finned fish like bettas, fancy goldfish, and some varieties of guppies, or fish with few or no scales, like dojo loaches, then you will need to carefully inspect all edges of the product, inside and out, to check for rough edges that may damage fins or scrape skin. Sharp edges should be dealt with no matter what type of fish you have.
    • If you do not clean your fish tank very often, this may need to be taken into account when you pick an aquarium castle. Some castles are more prone to collecting water that will begin to stagnate, especially in low-flow tanks. If you perform weekly cleaning and maintenance on your tank, then this shouldn’t be much of a problem since you can lift the décor and make sure it is getting adequate water flow.
    • If you have fish that like caves or swim-throughs but are too large to fit into the entrances of the castle you are considering, then you may need to reconsider the product. Some fish will get themselves stuck attempting to get into or out of spaces they don’t really fit into. If you think your chubby goldfish will try to swim into a hole it can’t fit into, then look at a castle with larger entrances and more cave space for your fish. Some fish are even known to shove themselves into the smallest parts of caves and hides, getting themselves stuck in the process.

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    Conclusion

    Did these reviews make you feel like a member of the royal family?

    The best overall aquarium castle is the Penn Plax Castle Aquarium Decoration because of its high quality, sturdiness, realistically aged paint job. The kathson Aquarium Decoration is the best value pick because it’s a low price for a quality, detailed product. If you’re interested in a more premium product, the Penn Plax Enchanted Castles Aquarium Decoration is a great choice made from high-quality materials with a realistic paint job and large internal cave space for your fish.

    Picking the right aquarium castle for your fish tank should be a fun experience, so we’re here to take some of the frustration out of the search for you. Turning your tank into royal grounds is not only aesthetically pleasing but creates interest and fun in the tank for your fish and invertebrates. Once you pick an aquarium castle for your fish tank, you and your fish will be feeling like royalty before you know it!


    Featured image credit: Oleksandr Khalimonov, Shutterstock