How Many Clown Killifish in a 40-Gallon Tank?
In a 40-gallon tank you can comfortably keep about 6–95 Clown Killifish. As a schooling species, never keep fewer than 6.
Why
Stocking is driven by adult size and waste output, not just fish count. Clown Killifish reaches about 1.4" with a light bioload, and needs 72–79°F water at pH 5.5–7. Always cycle the tank and test water before adding livestock.
| Adult size | 1.4" |
|---|---|
| Minimum tank | 10 gallons |
| Temperature | 72–79°F |
| pH | 5.5–7 |
| Temperament | Peaceful |
| Schooling | Yes — group of 6+ |
| Diet | Micropredator |
| Care level | Moderate |
| Origin | West Africa |
More fish for a 40-gallon tank → Clown Killifish tankmates →