hi i have a teacup sting ray, had it for about 7 weeks, wen i first got it would not eat at all, now it eats about like 1 or 2 ghost shrimps, and swims around like its dancing back and forward really fast trying to catch something wen nothing is der, wen it does catch something it kills not eating it and moves on trying to catch the rest. how do i know if the ghost shrimp are to big, because i do ask for the smallest 1s, iv tried blood worms and it ignores dem totally, it is skinny because i can its bones at the back next to its legs wat i do..it seems like its playing with the food