Mustard Tang

About

The mustard surgeonfish (Acanthurus guttatus) is one of the more visually distinctive tangs in the Indo-Pacific, recognizable by the bold white spots and bands that break up its darker body. The source of its alternate name, spotband surgeonfish. In the wild, this species is found across a sweeping range from the western Indian Ocean out to Hawaii, the Marquesas, and the Tuamotu Islands, living right in the thick of the action on clear seaward reefs where surge and strong currents are the norm. It is a genuinely schooling fish in nature, gathering in groups to graze on filamentous and calcareous algae over reef flats that most other fish avoid due to the pounding water movement. Bringing one into captivity means committing to a very large system. This is not a fish that settles comfortably into a modest setup. It grows to a respectable size and does best when kept with the kind of open, turbulent flow that mirrors its natural habitat. A dedicated algae grazer, it appreciates a tank with good microalgae growth and a varied plant-based diet. Its schooling instinct and surge-zone origins put it squarely in the intermediate-to-advanced category, suited to keepers with serious reef infrastructure already in place.