Purple Tang - Zebrasoma xanthurumPurple Tang (Zebrasoma xanthurum) The Purple Tang is a stunning and highly desirable marine surgeonfish, admired for its deep purple blue body, bright yellow tail and fine darker line patterning across the face and body. Also known as the Yellowtail Tang or Red Sea Purple Tang, this species is one of the most iconic tangs in the marine aquarium hobby. It is hardy once settled and generally reef safe, but it is also active, territorial and best suited