Orange Shoulder Tang Adult

The Orange Shoulder Tang, *Acanthurus olivaceus*, is a striking surgeonfish known for its vibrant coloration and active nature. Juveniles display a beautiful yellow body with a thin blue line running along the dorsal and anal fins. As they mature, the body color transitions to a more muted brown or gray, and a prominent, bright orange patch develops just behind the gill cover, giving the fish its common name. The tail fin remains a contrasting yellow.

A minimum tank size of 125 gallons is recommended for a single Orange Shoulder Tang to provide ample swimming space and reduce aggression. A larger tank is necessary if housing with other tangs. This species requires a well-established aquarium with plenty of live rock for grazing on algae and numerous hiding places. While generally considered reef-safe, they may occasionally nip at certain corals or sessile invertebrates, especially if not adequately fed.

The Orange Shoulder Tang is a herbivore and requires a diet rich in marine algae. Offer a variety of foods including high-quality marine flake and pellet foods, dried seaweed (nori) attached to a rock or clip, and frozen herbivore preparations. Supplementing their diet with fresh vegetables like blanched zucchini or broccoli can also be beneficial. In the wild, they primarily graze on filamentous algae.

In a home aquarium, the Orange Shoulder Tang can reach a size of up to 12 inches. They are active swimmers and require strong water flow. While sexing is difficult, they are not known to breed readily in captivity. They are generally peaceful towards other fish species but can be aggressive towards other tangs, especially those of similar size or shape. Introduce them to the aquarium last to minimize territorial disputes.