How Many Bettas in a 5 Gallon Tank?
About 1 — based on adult size, bioload, and real water volume.
About 1 betta
Photo via Wikimedia Commons
In a 5-gallon tank you can comfortably keep about 1 betta, on their own with good filtration and regular water changes. Add fewer if you're mixing in other species.
How we get that number
An adult betta reaches about 2.8" and has a moderate bioload. Working from real water volume and waste output (not the old one-inch-per-gallon myth), a 5-gallon tank supports roughly 1 of them. They need 76–82°F water at pH 6.5–7.5.
Build your exact stocking with the calculator → Full betta care guide →
Gear for a 5-gallon tank
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FAQ
How many betta can I keep in a 5 gallon tank?
About 1 betta, kept on their own with good filtration. Add fewer when combining with other species — use the stocking calculator to be sure.