Vampire Tang - Acanthurus tennentiiVampire Tang (Acanthurus tennentii) The Vampire Tang is a graceful surgeonfish with a pale grey brown body, a distinctive dark shoulder marking that develops into two curved bands as it matures, and vivid electric blue edging around the caudal spine area and tail. In the wild it inhabits lagoon and seaward reefs, as well as silty inshore to outer reef slopes, where it grazes on benthic algae either singly, in groups, or in small shoals. In aquaria it