it sucks losing a fish or ray. it was a retic. it was small so I know the sesitive nature of them. I'm starting to think it was the blackworms. I've always had problems with rays when all they ate was blackworms. you guys every have parasite problems with black worms? I've heard some people have with rays and discus. I try not to use blackworms to often. I gave some to my discus though. From now on I'm going to try to stay away from feeding blackworms to rays.