I feed my True Percula SF Bay Emerald Entree. I was told they were omnivores and need both meats and plants for proper nutrition.
I feed mine every other day and he eats like a pig. I have to spot feed my shrimp goby / pistol shrimp combo because he eats everything before it gets to the bottom. I've tried feeding more often and it doesn't help. He'll eat as long as I'm putting food in the tank.
Here are the ingredients of Emerald Entree:
Artemia Franciscana, mysis, krill, plankton, spinach, romaine lettuce, red leaf lettuce, spirulina algae, menhaden oil, sodium alginate, Vitamin premix: wheat flour, Vitamin A acetate, cholecalciferol (source of vitamin D3), vitamin B12 supplement, riboflavin, niacin, calcium pantothenate, folic acid, menadione sodium bisulfate complex, pyridoxine hydrochloride, thiamine mononitrate, biotin, inositol, L-ascorbyl-2-polyphosphate, betaine, d-alpha mixed tocopherols (source of vitamin E)