QUICK STATS Minimum Tank Size: 125 gallons Care Level: Moderate Temperament: Semi-aggressive Reef Compatible: Yes Water Conditions: 72-78° F, dKH 8-12, pH 8.1-8.4, sg 1.020-1.025 Max. Size: 10" Color Form: Blue, Purple, Yellow Diet: Herbivore Compatibility: View Chart Origin: Red Sea Family: Acanthuridae The Purple Tang, also known as the Yellowtail Sailfin Tang, Yellowtail Surgeonfish, and the Blue Surgeonfish, is blue to purple in color with a yellow tail and yellow accents on the pectoral fins. This fish was formally known only to the coral reefs of the Red Sea, but it is now found in the Arabian Sea, the Gulf of Aden and in the waters off Sri Lanka as well. It usually lives singly, but can occasionally be found in schools in the southern Red Sea. Adults can reach a size of 10 inches.