did u cut up worms into somewhat small pieces, this will help them want to eat it. they will eat other foods but right now there so slim anything they will eat keep feeding, no less than 3 times a day. keep trying new foods, yes it will be more work geting the un eaten food out but it will be worth it in the end. there is some info on them in string ray section of the forums. they get quite large. most important keep water clean clean, lots of water movment an air. feed no less than twice a day(but for u know no less than3) be careful of sting an do research on what to do when or if u do get stung. u dont wanna look it up if ur in pain. besides that there the coolest thing u can keep in ur tank imo, there great