Can Fancy Goldfish live with Red Tail Shark? With caution
Aggressive plus peaceful pairing — monitor for stress.
Side by side
| 🐠 Fancy Goldfish | 🦈 Red Tail Shark | |
| Adult size | 8" | 5" |
| Min tank | 20 gal | 55 gal |
| Temperature | 60–74°F | 72–79°F |
| pH | 6.5–8 | 6.5–7.5 |
| Temperament | Peaceful | Aggressive |
How to make it work
- Aggressive plus peaceful pairing — monitor for stress.
- Provide ample swimming space, sight breaks, and matched water parameters.