A little bit of everything and anything several times per week. My tank is old enough that the fish are able to find enough to eat in the meantime. I alternate between pelletized foods (Dainichi), flaked foods (omega one, OSI), frozen foods like mysids (PE, H2O Life), formula one, marine cuisine, formula 2, cyclops, silversides (mostly for the anemone), ocean plankton (various brands), daphnia, and anything else I can get my hands on.