Acanthurus Olivaceus
Acanthurus Olivaceus

Acanthurus Olivaceus

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Quick Stats

Care Level: Moderate
Temperament: Semi-aggressive
Color Form: Black, Blue, Yellow
Diet: Herbivore
Reef Compatible: Yes
Water Conditions: 72-78° F, dKH 8-12, pH 8.1-8.4, sg 1.020-1.025
Max. Size: 1' 2"
Origin: Fiji, Indonesia, Melanesia
Family: Acanthuridae
Minimum Tank Size: 180 gallons


The Orangeshoulder Tang is also known as the Orange-epaulette Surgeonfish, Orangespot Surgeonfish, Orangeband Surgeonfish, and Orangeshoulder Surgeonfish. As a juvenile, it is solid yellow, with just the slightest hint of blue fringing on the anal and dorsal fins. As an adult, the front half of the body turns light gray and the back half takes on a dark gray-blue color. Above the pectoral fins is an eyecatching orange stripe that is outlined by the dark gray color. The tail takes on a lyre shape.

A 180 gallon or larger aquarium is necessary to provide plenty of swimming room. It is not aggressive towards other Tangs. If housing more than one, it is best to add a juvenile to the aquarium that contains an adult.

Although Tangs will eat meaty foods along with the other fish in the aquarium, it is important that they are offered plenty of marine based seaweed and algae. This will strengthen their immune system, reduce aggression and improve their overall health. Offer dried seaweed tied to a rock or use a veggie clip, and feed at least 3 times per week. Sea Veggies, Seaweed Salad and Ocean Nutrition are all ideal products and are very easy to use.

Approximate Purchase Size: Juvenile Small: 3/4" to 1"; Small/Medium: 1" to 1-1/2"; Medium:1 1/2" to 1 3/4"; Medium/Large; 1 3/4" to 2 1/2" Large 2 1/2" to 3"; Changing Small: 2 3/4" to 3"; Medium 3" to 3 1/2"; Medium/Large 3 1/2" to 4"; Large 4" to 4 1/2"; Adult Medium: 3 1/2" to 4"; Medium/Large: 4" to 5"; Large: 5" to 6"; X Large 6" to 7"