How Many Jack Dempsey in a 55-Gallon Tank?
A 55-gallon tank suits 1 Jack Dempsey. 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. Jack Dempsey reaches about 10" with a heavy bioload, and needs 72–86°F water at pH 6.5–8. Always cycle the tank and test water before adding livestock.
| Adult size | 10" |
|---|---|
| Minimum tank | 55 gallons |
| Temperature | 72–86°F |
| pH | 6.5–8 |
| Temperament | Aggressive |
| Schooling | No |
| Diet | Carnivore |
| Care level | Moderate |
| Origin | Central America |