I have a 8 inch fire eel and they sure are picky eaters! Mine really loves to eat frozen bloodworms. I've tried several other foods(frozen krill, shirmp, and plankton) but it goes nuts over the bloodworms. It will pick at other food but won't own it and the other fish will snatch it away. If anyone touches her bloodworms they are going to get whiplashed by that tail fin.