Best 20 Gallon Fish Tanks of 2024

February 20, 2024

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20 gallon aquariums are the largest of the smaller tanks, before we start getting into medium sized setups. This makes them especially popular for aquarists that want something a little more spacious without being too hard to maintain. So let’s take a look at the top 20 gallon fish tank options for your next setup, shall we?

20 Gallon Aquariums

Allcolor Ultra Clear Rimless Aquarium

Rimless aquariums are perfect for hobbyists looking to upgrade the viewing capacity of their system! These aquariums use an ultra-low iron glass that has 91-95% light transmittance (versus 80-83% for standard glass tanks). You’ll often see it marketed as Starfire Glass since it’s close to invisible with the right lighting!

To further enhance the effect the Allcolor Rimless uses seams joined with adhesives alone; no dark rims to detract from the appearance of a floating box of water! Coupled with some bright LED lights and proper aquascaping, you can have an aquarium that’s on par with anything you’d see from the ADA (Aqua Design Amano) company!

The only downsides are the price and slightly more fragile character of starfire glass. But if you want the very best for your system there is no substitute!

Hagen Fluval Flex Aquarium 15 Gal

Hagen’s Fluval Flex lineup ranges from 9 to 32.5 gallons but their 15g model is a favorite of mine since its size is just right for the majority of aquarists! The main draw here is the curved bow front design, which makes for a pleasing interior design element. Fluval Flex tanks also have a proprietary curved wooden stand that matches it in color (white or black).

These setups also have LED bulbs that are bright enough to grow low to medium light plants like Guppy Grass and Java Fern. Integrated into the rear of the tank is a filter, with the pump and media included for quick setup! With 132 gallons per hour of flow, I did find that the pump was occasionally too strong for slow moving fish like Bettas. But for stronger swimmers, such as Tiger Barbs and Neon Tetras, the current generated is perfect for good exercise!

SeaClear Acrylic Aquarium Combo Set

SeaClear’s Acrylic Aquarium combo set includes not only the tank but also a 15 inch lighting strip to fully illuminate the rectangular setup. While we don’t get a filter or other accessories with this model, the main draw here is the advantages offered by an acrylic system.

Acrylic aquariums are the second most popular option after glass and are a great choice if the weight of glass is off putting. Acrylic tanks weigh only half as much as glass tanks do and they are robust enough to withstand impacts that would shatter a glass panel. They also hold heat much better.

On the other hand, acrylic tanks scratch very easily, so you’ll need to use special brushes when cleaning algae and debris from the panels! Lastly, acrylic can lose transparency if exposed to sunlight or high intensity UV radiation – but not from the included light!

GloFish Aquarium Kit Fish Tank with LED Lighting and Filtration

For folks looking at more traditional setups GloFish has a full aquarium kit that includes both lighting and filtration! This setup is designed specifically with GloFish in mind, which are aquarium fish genetically engineered to have fluorescent jellyfish proteins in their skin. The process is harmless and the fish glow radiant colors under blue lighting, which this kit provides!

Besides the 13-inch blue light, a TetraWhisper power filter, heater, and decorative plants and an anemone are provided, all of which also fluoresce under the included light! It’s the fastest way to create a 20 gallon tank setup for GloBarbs, GloBettas, and other GloFish! Black and/or rainbow gravel are most commonly used in GloFish setups (not included).

Tap water conditioner, a satchel of TetraMin flakes, and a filter cartridge are also included to help get you up and running as fast as possible!

Tetra Connect Curved Aquarium Kit 28 Gallon

The Tetra ColorFusion is a great 20 gallon tank with incredible LED lights! You can reduce the light output, change the color of the LED output, and feed your fish from a smart device through your home Wi-Fi LAN!

Tetra also includes an appropriately sized heater and TetraWhisper power filter, making substrate, decorations, and fish the only things left to buy! This setup is ideal for small children and others who typically need guidance when feeding or adjusting the light output.

Like most setups the Tetra ColorFusion uses the 20 gallon high style, sacrificing length for vertical height. However it also uses a custom bow front design for a curved presentation of your fish! Bow fronts of this size do not distort fish forms overmuch, giving you all of the benefits with none of the drawbacks.

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