Not an expert, but with mine I feed chunks o' shrimp once or twice a month. Most of the time it eats the same mysis shrimp that I feed the other critters. The chunk of shrimp is more or less a treat (of course "treat" implies that there is appreciation involved, I doubt that my LTA could give a fuzzy behind about appreciation) If it takes it, cool.. If not, then the bottom dwellers and clean-up crew have a heyday. Of course, that's if they can get some from the puffer. Everybody wins.