hikari gold and bio gold are both available in floating pellets... if you are really looking for a healthy diet for your natts, i would suggest eliminating the frogs, snakes, toads, and chicken trimmings. a healthy diet for your natts would include pellets, raw shrimp, tilapia, catfish, frozen krill and silversides. if you really get the urge to feed them some live food, get some healthy feeders and quarantine them first to make sure they are disease and parasite free.