I notice a couple of days ago one of my male rays was missing from the tank, to my surprise he was floating at the top of the tank as if he was surffing but his air holes were out the water, not sure what happen so i tested water (parameter were livable) but proceeded to do a 20% water change anyway and add a littel salt. That seems to calm him down and bring him back to the bottom of the tank, then the next day I noticed that one of his barb had come off, he still seemed okay but is not eating or swimming around nearly as much as he use to and last night I noticed that the tip of his tail looks to have some type of fungus/rot and as of this morning three days now and he still is not eating. Has anyone seen any of these issues or this type behavior, is there anything I can do? Keeping in mind that I have another ray in there with him that is doing well and eating up a storm. In fact of the two this one was the most out going.