Can Cardinal Tetra live with Oscar? Not recommended
Oscar is large or predatory enough to eat or harass Cardinal Tetra.
Side by side
| 🐟 Cardinal Tetra | 🐡 Oscar | |
| Adult size | 2" | 12" |
| Min tank | 15 gal | 75 gal |
| Temperature | 73–81°F | 74–81°F |
| pH | 4.5–6.5 | 6–8 |
| Temperament | Peaceful | Aggressive |
Why
- Oscar is large or predatory enough to eat or harass Cardinal Tetra.
- Aggressive plus peaceful pairing — monitor for stress.