I got a marbled electric ray about 3 1/2 weeks ago, and have not witnessed him eat. I've tried squid, silversides, goldfish, and tuna. his tank mates eat like pigs which are a 1 1/2 foot banded bamboo and a large 3ft+ white spotted bamboo, who all he does is eat lol! I've asked on my other forum SRC, and no one has had experience, and was hoping someone on here can help. he does swim around as if he's interested and I've tried to use tongs to feed him and push the others away, because he is electric, and im not risking touching him lol. I think he has shocked my other sharks because one second they will be chilling in their cave, and the next they'll dart out and go crazy, but there fine. any help would be vey helpful.