How Many Paradise Fish in a 20-Gallon Tank?
A 20-gallon tank suits 1 Paradise Fish. This species is territorial and is best kept singly unless the tank is large enough to break up aggression.
Why
Stocking is driven by adult size and waste output, not just fish count. Paradise Fish reaches about 2.6" with a moderate bioload, and needs 61–79°F water at pH 6–8. Always cycle the tank and test water before adding livestock.
| Adult size | 2.6" |
|---|---|
| Minimum tank | 20 gallons |
| Temperature | 61–79°F |
| pH | 6–8 |
| Temperament | Aggressive |
| Schooling | No |
| Diet | Carnivore |
| Care level | Easy |
| Origin | East Asia |