Acanthurus nigricans
Reef Compatible: Yes
Care Level: Intermediate
Disposition: Semi-aggressive
Min. Tank Size: 75 gallons
Mature Size: 8 inches
Product Specifications
| Feature | Value |
|---|---|
| Species | Acanthurus nigricans |
| Size Range | 1″ to 2″ (initial) |
| Reef Compatibility | Yes |
| Difficulty Level | Intermediate |
| Behavior | Semi-aggressive |
| Minimum Tank Size | 75 gallons |
| Mature Size | 8 inches |
FAQ
Is this fish suitable for a reef tank?
Yes, Acanthurus nigricans is reef compatible and can coexist with other reef-safe species.
What is the recommended tank size for this fish?
A minimum tank size of 75 gallons is required for proper growth and behavior.
How aggressive is this fish?
The fish is semi-aggressive and may display territorial behavior, especially during feeding or in overcrowded tanks.


Una Hardacre –
I added this fish to my 75-gallon reef tank after researching compatible species. It has adapted well and is active during the day. I noticed it occasionally nips at smaller invertebrates, so I’ve added some larger rock formations to provide hiding spots. Overall, it fits well in the tank and adds visual interest.
Kevin Springer –
The fish arrived healthy and has been active since setup. It’s not overly aggressive, but it does chase smaller fish occasionally. I’ve adjusted the tank layout to reduce stress. It’s a good fit for intermediate reef keepers.
Irene Walker –
After a few weeks, the fish has grown to about 1.5 inches and is now a regular part of the tank’s activity. I appreciate the clear labeling and accurate description. It’s a reliable addition to a balanced reef system.