I'm not a pro at keeping rays, so i need some help. I have a little motoro (about 4 1/2 inches in diameter) and i've been giving him a mix of ghost shrimp and live black worms for the past couple of weeks. The little thing is a bottomless pit, so I'm at the store getting him live food every other day. Its fun to watch him eat, and its not like hes burning a hole in my pocket, I'm just worried that he isn't getting enough of whatever nutrients rays need. The guy I bought him off of told me he'd also eat this food supplement with krill (which I got), and the ray isn't going for it. Why would he eat this in the store and not with me? I got another reccomedation to try earthworm pellets, and hes not having that either. He walks right over them and begs until I drop in something that moves. Like I said, I've only tried ghost shrimp, blackworms, those krill pellets, and the earthworm pellets. How do I coax him to try this other food again, or what should I do to wean him off of exclusively live food??