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Live fish now available! New arrivals added regularly Live fish now available! New arrivals added regularly

20 Gallons & Under

Discover a curated selection of versatile freshwater aquariums, 20 gallons and under, designed to fit seamlessly into any space while providing an ideal environment for your aquatic companions.
HelloReef GloFish Aquarium Kit
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48 Items

  1. HelloReef GloFish® Aquarium Kit
    HelloReef
    HelloReef GloFish® Aquarium Kit
    $399.99 $399.99

  2. Fluval Flex 15 Gallon Aquarium Kit
    2 Reviews
    Fluval
    Fluval Flex 15 Gallon Aquarium Kit
    $159.99 $159.99

  3. Fluval Flex 15 Gallon Aquarium Stand (Black)
    Fluval
    Fluval Flex 15 Gallon Aquarium Stand (Black)
    $94.99 $94.99

  4. UNS 30C 7 Gallon Aquarium Starter Kit
    Bulk Reef Supply
    UNS 30C 7 Gallon Aquarium Starter Kit
    $199.99 $199.99

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  5. UNS 90B 12 Gallon Aquarium Starter Kit
    Bulk Reef Supply
    UNS 90B 12 Gallon Aquarium Starter Kit
    $479.99 $479.99

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  6. 30C Rimless Aquarium - 7 Gallon
    Ultum Nature Systems
    30C Rimless Aquarium - 7 Gallon
    $79.99 $79.99

  7. 90B Rimless Aquarium - 12 Gallon
    Ultum Nature Systems
    90B Rimless Aquarium - 12 Gallon
    $141.99 $141.99

  8. 60L Rimless Aquarium - 6 Gallon
    Ultum Nature Systems
    60L Rimless Aquarium - 6 Gallon
    $89.99 $89.99

  9. 10 Gallon Scapers Planted Aquarium Kit
    AquaZen
    10 Gallon Scapers Planted Aquarium Kit
    $153.00 $180.00

  10. 4 Gallon Scapers Planted Aquarium Kit
    AquaZen
    4 Gallon Scapers Planted Aquarium Kit
    $119.00 $140.00

  11. Dice Series Pico Cube Aquarium (2 Gal)
    2 Reviews
    Maxspect
    Dice Series Pico Cube Aquarium (2 Gal)
    From: $199.99

    Choose Options Notify Me When In-Stock
  12. Fluval Spec 5 Gallon Aquarium Kit
    Fluval
    Fluval Spec 5 Gallon Aquarium Kit
    $124.99 $124.99

  13. EDEN 20 FLED Aquarium & Stand (20 Gallons)
    Waterbox Aquariums
    EDEN 20 FLED Aquarium & Stand (20 Gallons)
    From: $519.00

    Choose Options Notify Me When In-Stock
  14. 3 Gallon Nano Cube Rimless Aquarium Kit
    Lifegard Aquatics
    3 Gallon Nano Cube Rimless Aquarium Kit
    $94.99 $94.99

  15. 2 Gallon Nano Cube Rimless Aquarium Kit
    Lifegard Aquatics
    2 Gallon Nano Cube Rimless Aquarium Kit
    $84.99 $84.99

  16. 1 Gallon Nano Cube Rimless Aquarium Kit
    Lifegard Aquatics
    1 Gallon Nano Cube Rimless Aquarium Kit
    $79.99 $79.99

  17. Fluval Spec 5 Gallon Aquarium Starter Kit
    Bulk Reef Supply
    Fluval Spec 5 Gallon Aquarium Starter Kit
    $209.99 $209.99

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  18. Fluval Flex 15 Gallon Planted Aquarium Starter Kit
    Bulk Reef Supply
    Fluval Flex 15 Gallon Planted Aquarium Starter Kit
    $219.99 $219.99

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  19. Fluval Spec 16 Gallon Aquarium Kit
    Fluval
    Fluval Spec 16 Gallon Aquarium Kit
    $264.99 $264.99

  20. Fluval Spec 2.6 Gallon Aquarium Kit
    Fluval
    Fluval Spec 2.6 Gallon Aquarium Kit
    $95.99 $95.99

  21. Fluval Flex 9 Gallon Aquarium Kit
    Fluval
    Fluval Flex 9 Gallon Aquarium Kit
    $119.99 $119.99

  22. Fluval Betta Premium Kit (2.64 Gal)
    Fluval
    Fluval Betta Premium Kit (2.64 Gal)
    $99.99 $99.99

  23. Dice AIO 12 Gallon Nano Cube Aquarium
    Maxspect
    Dice AIO 12 Gallon Nano Cube Aquarium
    $199.99 $199.99

  24. DeskMate 4.8 Gallon AIO Aquarium w/ LED Light
    Eshopps
    DeskMate 4.8 Gallon AIO Aquarium w/ LED Light
    $179.98 $179.98

  25. 10 NUVO Fusion PRO 2 AIO Aquarium Bundle
    Innovative Marine
    10 NUVO Fusion PRO 2 AIO Aquarium Bundle
    $321.00 $321.00

  26. 20 Gallon Nano Rimless AIO Aquarium
    JBJ
    20 Gallon Nano Rimless AIO Aquarium
    $240.00 $240.00

  27. 15 Gallon Nano Rimless AIO Aquarium
    JBJ
    15 Gallon Nano Rimless AIO Aquarium
    $205.00 $205.00

  28. 10 Gallon Nano Rimless AIO Aquarium
    JBJ
    10 Gallon Nano Rimless AIO Aquarium
    $155.00 $155.00

  29. 12 Gallon Bookshelf Rimless Tank - Standard Glass
    Mr. Aqua
    12 Gallon Bookshelf Rimless Tank - Standard Glass
    $150.99 $150.99

  30. 3 Gallon Rimless Bow Front Aquarium
    Mr. Aqua
    3 Gallon Rimless Bow Front Aquarium
    $64.99 $64.99

  31. 7.5 Gallon Cube Tank - Low Iron Glass
    Mr. Aqua
    7.5 Gallon Cube Tank - Low Iron Glass
    $110.99 $110.99

  32. 7.5 Gallon Cube Tank - Standard Glass
    Mr. Aqua
    7.5 Gallon Cube Tank - Standard Glass
    $84.99 $84.99

  33. Foresta Paludarium 60E
    Ultum Nature Systems
    Foresta Paludarium 60E
    $439.99 $439.99

  34. Foresta Paludarium 35E
    Ultum Nature Systems
    Foresta Paludarium 35E
    $349.99 $349.99

  35. 20 Gallon Nano Aquarium Stand - Black
    JBJ
    20 Gallon Nano Aquarium Stand - Black
    $245.00 $245.00

  36. 15 Gallon Nano Aquarium Stand - Black
    JBJ
    15 Gallon Nano Aquarium Stand - Black
    $235.00 $235.00

  37. 10 Gallon Nano Aquarium Stand - Black
    JBJ
    10 Gallon Nano Aquarium Stand - Black
    $225.00 $225.00

  38. HelloReef 15 Gallon Aquarium Stand
    4 Reviews
    HelloReef
    HelloReef 15 Gallon Aquarium Stand
    From: $149.99

    Choose Options Notify Me When In-Stock
  39. 60U Rimless Aquarium - 20 Gallon
    Ultum Nature Systems
    60U Rimless Aquarium - 20 Gallon
    $174.99 $174.99

  40. 45T Rimless Aquarium - 11 Gallon
    Ultum Nature Systems
    45T Rimless Aquarium - 11 Gallon
    $134.99 $134.99