Rhinecanthus rectangulus – Rectangle Triggerfish (Size: M, 2″ to 3″)
Reef Compatible: No
Care Level: Beginner
Disposition: Aggressive
Min. Tank Size: 50 gallons
Mature Size: 12 inches
| Feature | Detail |
|---|---|
| Species | Rhinecanthus rectangulus |
| Size (Adult) | Up to 12 inches |
| Size (Available) | 2″ to 3″ |
| Compatibility | Not reef-safe; avoid with corals or sensitive invertebrates |
| Behavior | Aggressive; may nip at other fish or decorations |
FAQ
Is this fish suitable for a beginner aquarist?
Yes, this triggerfish is labeled as beginner-friendly in terms of care requirements, but its aggressive nature requires careful tank setup and monitoring.
Can this fish be kept with other fish in a community tank?
No, due to its aggressive disposition, it should not be kept with smaller or more timid fish. It may attack or injure them.
What is the minimum tank size recommended for this fish?
A minimum tank size of 50 gallons is required to provide adequate space and reduce stress.



Thomas Mills –
Got this fish for my 50-gallon tank. It’s active and colorful, though it does nip at a few of my smaller fish. I’ve had to rearrange some decorations to avoid damage. Still, it’s a striking addition and fits well in my setup.
Sally Langdon –
The fish looks great and is easy to maintain. I noticed it’s quite territorial, so I made sure to keep it in a larger tank with plenty of hiding spots. Not ideal for a small or mixed community tank.
Maria Howard –
Beautiful fish with a bold appearance. I’ve kept it for over six months and it’s still healthy. Just be prepared to manage its behavior with proper tank layout and fish selection.