How Many Upside-Down Catfish in a 125-Gallon Tank?
In a 125-gallon tank you can comfortably keep about 5–35 Upside-Down Catfish. As a schooling species, never keep fewer than 5.
Why
Stocking is driven by adult size and waste output, not just fish count. Upside-Down Catfish reaches about 3.5" with a moderate bioload, and needs 72–82°F water at pH 6–7.5. Always cycle the tank and test water before adding livestock.
| Adult size | 3.5" |
|---|---|
| Minimum tank | 20 gallons |
| Temperature | 72–82°F |
| pH | 6–7.5 |
| Temperament | Peaceful |
| Schooling | Yes — group of 5+ |
| Diet | Omnivore |
| Care level | Easy |
| Origin | Congo basin |
More fish for a 125-gallon tank → Upside-Down Catfish tankmates →