Description
A large, powerful surgeonfish recognized by the prominent horn (“unicorn”) projecting from its forehead. The body is typically grey to bluish with subtle markings, and adults develop a more pronounced horn and thicker profile. This species is an open-water swimmer, built for cruising long distances, and becomes very impressive in size.
Lighting
Moderate to strong lighting
(Helps maintain natural coloration and activity)
Placement (Aquarium Zone)
Upper to mid-water column
Requires very large open swimming space with minimal obstruction
Temperature
24–27°C (75–81°F)
Salinity
1.020–1.025 SG
pH
8.1–8.4
Alkalinity
8–12 dKH
Diet
Herbivore / omnivore
Marine algae (nori, seaweed sheets)
Brown macroalgae (preferred in wild)
Spirulina-based foods
Occasional mysis or meaty foods
Adult Size (up to)
~60–70 cm (24–28 inches)
Care Level
Advanced
(Requires massive tank size, strong filtration, and high oxygen levels)
Compatibility
Generally peaceful for its size
Can be kept with other large, non-aggressive fish
Reef-safe (does not harm corals)
May show mild aggression toward other large tangs
Not suitable for small or even medium home aquariums
