How Many Glowlight Tetra in a 40-Gallon Tank?
In a 40-gallon tank you can comfortably keep about 6–53 Glowlight Tetra. As a schooling species, never keep fewer than 6.
Why
Stocking is driven by adult size and waste output, not just fish count. Glowlight Tetra reaches about 1.5" with a light bioload, and needs 74–82°F water at pH 5.5–7.5. Always cycle the tank and test water before adding livestock.
| Adult size | 1.5" |
|---|---|
| Minimum tank | 10 gallons |
| Temperature | 74–82°F |
| pH | 5.5–7.5 |
| Temperament | Peaceful |
| Schooling | Yes — group of 6+ |
| Diet | Omnivore |
| Care level | Easy |
| Origin | Essequibo basin, Guyana |
More fish for a 40-gallon tank → Glowlight Tetra tankmates →