Whoa, talk about bringing this thread back from the dead...
The shark is doing great (just started a new thread since this one got so off topic) she is growing very slowly but still eating wonderfully, the CUC is still intact even though I was worried she would start eating them.
The stingray died
after speaking with the LFS that I bought it he confirmed the man he was purchasing from was stunning his livestock and thinks perhaps the ray had some internal problems-such as organ failure, our parameters and everything else eliminated the possibility of being something we did, especially considering everything else lived through it. His stingray also died before ours, as did his shark... my shark was the only one that survived. We didnt return to that store after that.