Sleek Unicornfish

The Sleek Unicornfish is one of the largest and most streamlined members of the Naso genus, reaching an impressive 30 inches in the wild. Unlike some of its unicornfish relatives, this species does not develop the prominent forehead horn, instead maintaining a sleek, torpedo-shaped profile that reflects its adaptation for fast swimming in open water. Adults display a blue-gray body with subtle spotting and a distinctive dark tongue.

In the wild, Sleek Unicornfish inhabit outer reef slopes, drop-offs, and current-swept channels throughout the Indo-Pacific. They are strong, fast swimmers that often form large schools in midwater, where they feed primarily on zooplankton. This planktivorous diet sets them apart from many other surgeonfish that are dedicated herbivores, and it influences their care requirements in captivity.

Due to its very large adult size and active swimming habits, the Sleek Unicornfish requires an enormous aquarium of at least 300 gallons, with even larger systems being preferable. This is a species for expert aquarists with the resources to provide adequate space and water quality. Despite its demanding space requirements, it is a stunning display fish that brings open-ocean energy to a large reef or FOWLR system.