White Margin Unicorn Tang (Naso annulatus)

Naso annulatus is one of the largest tangs sold in the hobby, capable of pushing past two feet in a big enough system, and unlike most reef tangs it spends real time schooling in open water to pick zooplankton out of the current rather than grazing rock full-time. A crisp white margin along the fins and a facial horn that thickens with age round out a fish that's built more like an open-ocean cruiser than a reef grazer.

Care level: Moderate · Temperament: Semi-aggressive · Max size: ~24" · Min tank: 180+ gal · Diet: Herbivore, algae + herbivore pellets