Can Common Goldfish live with Oscar? Not recommended
Temperature ranges don't overlap (74–81°F vs 60–72°F).
Side by side
| 🐠 Common Goldfish | 🐡 Oscar | |
| Adult size | 12" | 12" |
| Min tank | 40 gal | 75 gal |
| Temperature | 60–72°F | 74–81°F |
| pH | 6.5–8 | 6–8 |
| Temperament | Peaceful | Aggressive |
Why
- Temperature ranges don't overlap (74–81°F vs 60–72°F).
- Aggressive plus peaceful pairing — monitor for stress.