MadManMac- if you have surface agitation then the flake should eventually sink. If not, then you can take pinch and place it in the water yourself(no floating flake). A lot of people make thier own food(various methods) utilizing grocery store seafood(mussels, clams, shrimp, etc.....). There is mysis shrimp, cyclops-eeze, nori strips(for tangs and angels and other algae grazers), there's pellet(though I rarely feed them-I use them to facilitate garlic-they absorb the garlic well). The key is to try a varied diet, but stay as close to possible to their natural diet. Then there's rotifers, krill, brine shrimp, etc, etc,...