My yellow and Hippo tangs love Formula Two pellets, the medium size, which will drop to the bottom. In another aquarium, I have a red striped squirrelfish, a rabbitfish, a flame hawkfish, and a lunare wrasse, and these fish really prefer things that float for awhile, like flake, krill, plankton, frozen food, and small pellets, which seem to float for a little while. Anything that drops to the bottom they seem to have problems finding.