Hey guys, sadly a couple weeks ago my reticulated stingray died. I have done a lot of research on his death but then again I'm not even 100% sure, my main conclusion was ammonia poisoning. So anyways, after getting rid of two fish, and on to the third, I also did a restless amount of research and I know how to make my tank suitable for another ray. I plan on getting another retic ray once I boost my biofiltration soon. So I want know from an experts point of view how you can tell if a LFS ray is healthy? I know so far that if it's stomach is sunken in it's not eating (also the hip bones protruding). And possibly the most obvious, if it's fins are curling it has death curl. But can anyone tell me fool proof ways to tell if a LFS stingray is healthy or if it has diseases and what diseases?? I'm planning on getting it from a different LFS before because it's closer and cheaper (the other LFS was good still). So I want to make sure that the rays they have are healthy. Thanks for reading!