rimless aquarium

If you’ve been looking at 20-gallon rimless aquariums but aren’t sure where to start, we’re here to help! Finding a high-quality rimless aquarium is important to make sure the tank not only meets your needs but doesn’t leak at the seams. Rimless aquariums are sleek and beautiful, and you don’t want that aesthetic to be ruined by a flood in your living room.

We’ve put together reviews of the top 4 best 20-gallon rimless aquariums to help you make an informed decision on the perfect aquarium to meet your needs. Rimless aquariums are perfect whether you’re wanting to create an aquascape or a home for fish or invertebrates. Rimless aquariums are a great option for customization, allowing you to bring your aesthetic to life in your home.

Keep reading to learn about our favorite 20-gallon rimless aquariums.

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A Quick Comparison of Our Favorites

Image Product Details
Best Overall
Winner
SeaClear Acrylic Aquarium SeaClear Acrylic Aquarium
  • Clear, nearly seamless edges
  • Lighter than glass
  • Flat lid
  • Best Value
    Second place
    Lifegard Aquatics Iron Crystal Aquarium Lifegard Aquatics Iron Crystal Aquarium
  • Beveled edges
  • 92% clarity ultra-low iron glass
  • Clear silicone sealed edges
  • Premium Choice
    Third place
    Landen 60P Rimless Low Iron Aquarium Landen 60P Rimless Low Iron Aquarium
  • Includes foam leveling mat
  • 91% clarity low iron glass
  • Clear silicone sealed edges
  • SC Aquariums All in One Aquarium SC Aquariums All in One Aquarium
  • Clear silicone edges
  • Low iron glass on three sides
  • Safe for freshwater and saltwater
  • The 4 Best 20 Gallon Rimless Aquarium – Reviews 2021

    1. SeaClear Acrylic Aquarium – Best OverallSeaClear Acrylic Aquarium

    The best overall 20-gallon rimless aquarium is the SeaClear Acrylic Aquarium. This aquarium is available in multiple sizes and shapes, including two 20-gallon versions. This tank is safe for saltwater and freshwater.

    Acrylic has a higher chance of scratching than glass, but it is 17 times lighter than glass, clearer than glass, and does not create the visual distortion often seen in glass tanks. Acrylic is impact-resistant and shatterproof, although it still can break if knocked off of a surface. This tank has clear, nearly seamless corners and a built-in lid. The lid cannot be removed from the tank, but it has two holes large enough to fit your arms into and a slotted opening perfect for a filter.

    The measurements of this tank are 24 inches long by 13 inches wide by 16 inches high. The built-in lid sits flat, so there is not a raised hood. This tank kit includes the tank, a removable light, and backing. There is more than one solid backing color available, and you can also purchase this tank without backing for use in the middle of a room.

    Pros
    • Clear, nearly seamless edges
    • Large openings in lid for maintenance and filter
    • Lighter than glass
    • Clearer than glass and with less visual distortion
    • Includes built-in lid, light, and optional backing
    • Available in multiple sizes and shapes including two 20-gallon options
    • Flat lid
    Cons
    • Acrylic is easy to scratch
    • Lid is not removable

    2. Lifegard Aquatics Iron Crystal Aquarium – Best ValueLifegard Aquatics Ultra Low

    The Lifegard Aquatics Iron Crystal Aquarium is the best 20-gallon rimless aquarium for the money. This tank is made from ultra-low iron glass and has beveled edges, making it less likely to scratch or cut yourself on the edges. Low iron glass has a higher clarity than regular glass, with this tank having clarity around 92%. This tank is available in multiple sizes other than 20-gallon.

    The corners of this glass tank are sealed with clear silicone, giving them a nearly seamless appearance. This tank has strong, ¼-inch thick glass, so it is heavier than acrylic and not shatterproof. The weight of glass tanks makes them less likely to be knocked off of surfaces.

    This tank measures 24 inches by 12 inches by 14 inches and includes a foam leveling mat to ensure it sits perfectly flat. This aquarium does not include lighting or a lid.

    Pros
    • Beveled edges
    • 92% clarity ultra-low iron glass
    • Available in multiple sizes
    • Clear silicone sealed edges
    • Less likely to be knocked off surface than acrylic tanks
    • Includes foam leveling mat
    Cons
    • Heavier than acrylic
    • Not shatterproof
    • Does not include lighting or lid

    3. Landen 60P Rimless Low Iron Aquarium – Premium ChoiceLanden 60P

    The premium pick for 20-gallon rimless aquariums is the Landen 60P Rimless Low Iron Aquarium. This tank is made from low iron glass with 91% clarity. The glass in this tank is 8mm thick, which is just over ¼ inch. This tank is available in multiple sizes.

    This tank measures 23.6 inches by 15.7 inches by 15.7 inches. The edges are sealed with clear silicone and this tank is heavy enough to not be easily knocked over, although it is not shatterproof. It does not include a lid or light, but it does come with a foam leveling pad. This tank should be placed on a level surface with the mat underneath. It has flat edges, which may cause cuts or scrapes if not handled carefully.

    There is a small “Landen” logo on the front lower corner of this tank, but it can easily be removed with a razor blade if desired.

    Pros
    • 91% clarity low iron glass
    • Available in multiple sizes
    • Clear silicone sealed edges
    • Less likely to be knocked off surfaces than acrylic tanks
    • Includes foam leveling mat
    • Logo on the front can easily be removed
    Cons
    • Heavier than acrylic
    • Not shatterproof
    • Flat edges may be prone to causing cuts and scrapes
    • Does not include lighting or lid

    4. SC Aquariums All in One AquariumSC Aquariums

    The SC Aquariums All in One Aquarium is made from low iron glass, making it clearer than regular glass. This tank is actually 24 gallons, but it has a built-in rear 3-chamber overflow, which takes away from the overall size of the tank, leaving it with approximately 16 gallons of tank space. This tank is saltwater and freshwater safe.

    This kit comes with a return pump and plumbing kit and is easy to set up. The 3-chamber overflow of this tank means that this tank can be used as a primary tank with built-in filtration or as a sump and refugium combination tank. The glass behind the 3-chamber overflow is not made from low iron glass, so it is less clear.

    This tank measures 24 inches by 15 inches by 15 inches. It has clear silicone edges and flat glass, so it may cause cuts and scrapes. It does not include a lid or lighting.

    Pros
    • Safe for freshwater and saltwater
    • Built-in 3-chamber overflow for filtration or sump and refugium setup
    • Clear silicone edges
    • Low iron glass on three sides
    • Includes plumbing kit and return pump
    Cons
    • Built-in chambers reduce swimming space in the tank
    • Flat edges may be prone to causing cuts and scrapes
    • Does not include lid or light
    • Heavier than acrylic
    • Not shatterproof

    Buyer’s Guide

    Tips for Buying a Rimless Aquarium:
    • Stay within your budget. There are great options for rimless aquariums that fit most budgets, so don’t break the bank trying to bring home the most expensive rimless tank on the market.
    • Money isn’t everything! A higher price tag doesn’t necessarily mean a product is a higher quality. Sometimes you’re paying for a brand name or to cover import fees on products. Pick a solid product with good reviews and a good return policy or warranty if things go wrong.
    • Buy a standard-shaped aquarium. Odd-shaped aquariums can look really cool, but you may end up needing to add products to your aquarium at some point, like a lid, rim, or light. A standard rectangular or cube-shaped tank is going to save you a lot of trouble on the back end if you think you’ll need to purchase add-ons and don’t want to pay for custom items.
    • Testing all tanks to make sure they’re water-fast before you set them up completely is a good practice, but it’s especially important with rimless aquariums. One of the functions of the rim on regular aquariums is providing support and bracing to keep the pressure of the water from pulling the glass apart. Even the best products can fail sometimes, and the last thing you want is to get home and start cycling a tank that leaks all over your floor.
    • Pick a tank that is going to meet all of your intended needs. If you are interested in creating aquascapes or even landscapes with sharp or rough objects like gravel, a glass tank is going to work better for you than an acrylic tank. If you want to attach a lot of décor or equipment to your tank, make sure to pick one that will be strong enough to hold whatever you put on it. If you want to install an external filtration system and intend to install hoses through the walls of the tank, then consider the difficulty of drilling glass versus acrylic. Acrylic is less like to shatter, glass is less likely to scratch, so it’s up to you to decide which problem you’d rather risk.
    Things Rimless Aquariums are Good for:
    • Vivariums: Vivariums are similar to terrariums except part of the design sits underwater and the other part sits above the waterline. Rimless aquariums are a great option for vivariums because they allow for full viewing of the contents of the tank while securely keeping water inside.
    • Non-escapees: Some fish and invertebrates are notorious for being escape artists and jumpers, like goldfish, mystery snails, and dojo loaches, so they do best in tanks with rims that help prevent escapes. If you’re planning to keep dwarf shrimp, guppies, tetras, mollies, or other somewhat laid-back fish and invertebrates, then a rimless aquarium should suit your needs.
    • Tall Plants: There are multiple types of tall plants that will only flower above the waterline, like Giant Hygrophila and Cabomba. A rimless tank not only allows these plants to reach their full height potential, but it creates uninterrupted viewing of the entire plant from base to flowers or top of the stems.
    • Floating Plants: If you plan to have floating plants with long, trailing roots, like red root floaters and water lettuce, then a rimless tank will allow you to view the entire plant, much like you can with tall plants. With floating plants, they usually do not grow very tall from the waterline, so a rimless tank will give you the chance to see the entire plant that is usually covered by tank rims.
    • Modern Spaces: Rimless aquariums bring a modern look to just about any space, making even small spaces feel brighter and more open. Rimless aquariums have a clean silhouette that enhances modern décor and can bring a lot of life and interest to your space.
    • Partially Aquatic Animals: This one is a tough call but it’s completely dependent on what animal you are wanting to keep. If you’re planning on using a rimless tank for an aquatic turtle, then it would be a good option for you because a turtle is unlikely to jump out of the tank and the tank itself will give you a great view of your reptilian friend. If you’re planning on keeping a fire-bellied toad, then a rimless tank with a lid could work great for you because it still creates the visual appeal without allowing your amphibious friend to jump out of the tank.
    Why Pick an Acrylic Tank? Why Pick a Glass Tank?
    Lightweight Heavy weight makes it difficult to knock off of surfaces
    Clearer than glass Supports larger amounts of water without needing a rim
    Can be made without seams Seams can be stripped and redone if the tank becomes damaged
    Shatterproof Extremely difficult to scratch
    More unique shapes available than with glass Standard shapes and measurements make finding pieces like lids easier
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    Conclusion

    Out of the tanks we reviewed, the SeaClear Acrylic Aquarium beat them all out as the best overall tank because of its lightweight, strong acrylic and built-in lid. The Lifegard Aquatics Iron Crystal Aquarium took its spot as the best value 20-gallon rimless aquarium because of its high quality and high clarity for a fair price. For a premium product, the Landen 60P Rimless Low Iron Aquarium because of its high quality and high clarity for a premium price under a trusted name. The SC Aquariums All in One Aquarium was the “honorable mention” of the group because, while it’s not without its flaws, it’s high quality and the built-in chambers make it a great option for built-in filtration or sump and refugium systems.

    Did these reviews help you find a 20-gallon rimless aquarium to meet your needs? The best part about rimless aquariums is how customizable they are. If you decide you want a lid or a light, you have plenty of options available. A rimless aquarium will bring a timeless but modern look into your home.


    Featured image credit: Africa Studio, Shutterstock