A. olivaceus is an attractive surgeonfish. Adults have an orange, blue-framed band on the shoulder, an ornate lyre-shaped tale, and a body color that can change from dark to light two-tone olive. A. olivaceus is also unusual in that juveniles have a distinct yellowish coloration. Adult A. olivaceus are moderately common on shallow tropical and subtropical Indo-Pacific reefs from Hawaii to Western Australia. They live singly or in small schools and feed on detritus, diatoms, and fine filamentous algae. A. olivaceus is a hardy and mostly docile aquarium fish, but because of its large size (averaging 12”) it requires large tanks (150+ gallons) with lots of swimming room.