The problem with anything but real live food is that it simply does not move like real food. Real live things like artemia or similar foods move about and present a target for a fish to attack and eat. Flake, frozen and freeze dried foods all simply sit there without moving. Since they do not move, they do not invoke the natural hunting instincts of your fish. No matter how complete the nutrition may be, the first challenge is to get the fish to eat them. That is often the problem area, not the nutrient value of dry foods. Many dry foods are what may be called ideal in nutrient value but unless we can get our fish to eat them the benefit will be lost.