Can cardinal tetras and mollies live together?
No
Cardinal tetras and mollies should not share a tank.
Why
- Mollies want a pH of 7.5 or higher, but cardinal tetras want 7.0 or lower. No pH suits both.
What each one needs
| Cardinal tetra | Molly | Both | |
|---|---|---|---|
| Temperature | 73–84°F (23–29°C) | 72–82°F (22–28°C) | 73–82°F (23–28°C) |
| pH | 5.0–7.0 | 7.5–8.5 | No overlap |
| Minimum tank | 20 gal (76 L) | 20 gal (76 L) | 20 gal (76 L) |
| Keep at least | 6 | 3 | |
| Adult size | 2 in (5.1 cm) | 4 in (10.2 cm) |