Guide
What can you keep in a 5 gallon tank?
Small tanks have strict limits. Use our free stocking calculator to check compatibility. Best options: one betta, shrimp, or a very small nano setup.
Best options for 5 gallons
- One betta: A 5 gallon is a good minimum for a betta. Heater and filter required. No other fish with a betta in 5 gallons; shrimp or snails can work if the betta is not aggressive.
- Shrimp only: Cherry shrimp or similar in a planted 5 gallon is popular. No fish needed.
- Single pea puffer or similar nano: Research carefully; 5 gallons is tight and water quality swings faster than in larger tanks.
What not to put in a 5 gallon
Do not keep goldfish, tetras (they need a school and more space), or multiple fish that need groups. Avoid overstocking; ammonia and nitrite can spike quickly. Keep up with water changes and testing. Track your tank with App-aquatic.
Quick takeaways
- 5 gallons: one betta, or shrimp, or one very small nano fish.
- Heater, filter, and regular maintenance are essential.
More guides · Betta care · 10 gallon · Fish per gallon · Get the app