How Many American Flagfish in a 55-Gallon Tank?
In a 55-gallon tank you can comfortably keep about 3–24 American Flagfish. As a schooling species, never keep fewer than 3.
Why
Stocking is driven by adult size and waste output, not just fish count. American Flagfish reaches about 2.5" with a moderate bioload, and needs 65–79°F water at pH 6.5–8.5. Always cycle the tank and test water before adding livestock.
| Adult size | 2.5" |
|---|---|
| Minimum tank | 20 gallons |
| Temperature | 65–79°F |
| pH | 6.5–8.5 |
| Temperament | Semi-aggressive |
| Schooling | Yes — group of 3+ |
| Diet | Omnivore |
| Care level | Easy |
| Origin | Southeastern United States |
More fish for a 55-gallon tank → American Flagfish tankmates →