I have kept and am currently keeping several Tangs. The Tangs I currently have are a Sohal, Powder Blue, 2 Blue Hippos, Sailfin, and Desjardinii Sailfin. They all get frozen foods by Ocean Nutrition and their daily meal consists of some Formula One, Formula 2, Spiralina Formula, and some dried Sea Veggies by Julian Sprung and Ocean Nutrition brand. They have all stayed very healthy and eat lots. In addition to their daily feedings since there are other fish present they also get some Trigger Formula, Pygmy Angel, Angel, Special Form VHP, and occasionally some live brine. Tangs require a very diverse feeding schedule in order not to fall victim to HLLE (head and lateral line erosion) so just keep his diet varied and all should be fine.