I feed Ocean Nutrition Formula One flake. I only feed them a little pinch of that before I feed live black worms or frozen mysis and brine shrimp. After I feed that I rubber band some nori to a rock for my grazers. I don't think flake should be a primary source of food, but I do think feeding a good flake can help enhance a fish's coloring. Just my opinion. And my fish seem to like it too.