hi its my first time to own a saltwater ray and i bought the blue spotted one have him for about 2 months and he was doing fine until now i noticed some changes... i've removed the other fishes and put them in a QT cos of some whitespot problems... ive heard rays are not immuned to ich.... was wondering if my ray now has some kind of a problem i cant quite pinpoint exactly... he shows heavy breathing and losing some color in his tail, and hes not as active as before, also noticed loose/ sort of wrinkly skin in some parts... ive changed his diet from guppies to shrimp and cut fish, he seems to be eating okay but im worried he might have some disease he got from my other fishes... what exactly are the most common diseases for saltwater rays and how to treat them? any help would be great!!!!