The Achilles Tang, also known as the Red-tailed Surgeon, or Achilles Surgeonfish, is very dark brown to purple. It has bright highlights of white and orange around the dorsal, caudal, and anal fins. A white marking is also present on the gill covers and a striking orange teardrop is found near the caudal fin. The juveniles of this species have an orange marking by the tail in the shape of a streak instead of being teardrop in shape.
A 180 gallon aquarium or larger is necessary to provide plenty of swimming room,and these fishes require strong water flow as they are normally found in surge zones. It is aggressive towards other Tangs and Surgeonfish, but peaceful with other fish.