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.
- 5 gallons: one betta, or shrimp, or one very small nano fish.
- Heater, filter, and regular maintenance are essential.
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.
Keep learning
Stable aquariums come from consistent testing and patient stocking. Continue with our water parameters guide, how to cycle a tank, and combining fish safely. For logging and strip scans, see App-aquatic.
Log parameters, scan strips offline, and run stocking checks with App-aquatic.
Get the free appBest options for 5 gallons?
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 .
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 .
How does regular testing help?
Regular testing lets you catch ammonia, nitrite, and nitrate shifts before fish show stress. Log results over time to see trends, not single snapshots.
More guides · Betta care · 10 gallon · Fish per gallon · Get the app