I have a gold spilo a little bit bigger than that, and he doesn't like beefheart or krill, i feed him rosies(occasionally) and he loves pellets and i take some of the big guys' smelt for him, he seems to like that.
I feed my gold spilo (which is also about quarter size, maybe more like silver dollar size) feeder goldfish. He usually just bites their tails off. Occasionally he will eat half of the fish and today he ate almost a complete fish. Sometimes I put cut up earthworm in there, but then it just sits there for a while. Mine is still extremely skittish. But I want to get him used to feeders to make him more aggressive!! Swwwweeeettt!