Siganus niger – Tongan Black Foxface
Reef Compatible – With Caution
Care Level – Intermediate
Disposition – Peaceful
Min. Tank Size – 60 gallons
Mature Size – 9.5 inches
Product Specifications
| Feature | Detail |
|---|---|
| Species | Siganus niger |
| Size (Adult) | 9.5 inches |
| Size (Available) | 3″ to 4″ |
| Compatibility | Reef compatible with caution |
| Behavior | Peaceful |
| Difficulty Level | Intermediate |
| Minimum Tank Size | 60 gallons |
FAQ
Is this fish suitable for a reef tank?
Yes, but with caution. Siganus niger can be reef compatible, though it may pose a threat to smaller polyps or soft corals. Monitor closely and ensure adequate space and hiding spots.
What is the expected growth rate of this fish?
The fish grows to a mature size of 9.5 inches. In the provided size range (3″ to 4″), it is likely in early to mid-stage development.
Is this species aggressive or peaceful?
This fish is peaceful and generally does not display aggressive behavior toward other tank inhabitants.

Jake Ince –
I’ve had the Tongan Black Foxface for three months now. It’s very calm and doesn’t bother the corals. The tank is 60 gallons and it’s thriving. Only noticed it occasionally nips at a small anemone, but I’ve since added more cover. Overall, a great addition to a reef setup with proper care.
Oliver MacLeod –
The fish arrived healthy and active. It’s been adjusting well to the tank. I’m cautious about its interaction with soft corals, so I’ve kept them at a distance. It’s peaceful and doesn’t chase other fish.
Sally Chapman –
This species is exactly as described. The size is within the 3 to 4 inch range when young. It’s not aggressive and blends well in the tank. I appreciate the clear care notes provided.