Heaters, filters and fixes sized for tanks under ten gallons.
Small tanks are less forgiving than big ones. Temperature swings faster, a strong filter becomes a current, and a heater built for twenty gallons can be too much for three. The guides here are sized for betta tanks, shrimp tanks and desktop setups, with the numbers that tell you whether a product actually fits.
12 guides in this section
A 10 gallon tank is the most practical entry point for a community aquarium. Here is what is worth buying and what the standard kits leave out.
4 picks · 5 sourcesUpdated September 27, 2026
A 5 gallon tank is the minimum for a betta and the entry point for most nano setups. Here are the kits worth buying and what to watch out for.
4 picks · 5 sourcesUpdated September 27, 2026
A heater failure is a fish emergency. Here is how to choose one that holds temperature accurately and does not fail.
4 picks · 5 sourcesUpdated September 27, 2026
Betta fish are carnivores. Most generic tropical fish flakes do not meet their nutritional needs. Here is what does.
4 picks · 5 sourcesUpdated September 27, 2026
Most fish are not compatible with bettas. These are the ones that are, and why.
4 picks · 4 sourcesUpdated September 27, 2026
You cannot rush the nitrogen cycle. But you can speed it up with the right approach and measure it accurately with the right test kit.
3 picks · 3 sourcesUpdated September 27, 2026
Fin rot is the most common betta health problem and the most preventable. Here is what causes it, what to buy and what to change in the tank.
3 picks · 5 sourcesUpdated September 27, 2026
Live plants improve water quality, reduce algae and give fish better behavior. These are the ones that survive a beginner setup.
4 picks · 4 sourcesUpdated September 27, 2026
A nano aquarium is not just a small tank. The best ones have filtration and lighting built in for the species they are meant for.
4 picks · 4 sourcesUpdated September 27, 2026
Shrimp are smaller and more sensitive than most fish. The wrong tank, filter or substrate ends a colony fast.
4 picks · 5 sourcesUpdated September 27, 2026
The wrong filter stresses small fish and shreds fins. Here are four that match the flow rate to the tank.
4 picks · 5 sourcesUpdated September 27, 2026
Most heaters are sized for bigger tanks. These three are rated for small ones, with the numbers to prove the fit.
3 picks · 7 sourcesUpdated September 26, 2026
