thank you guys for all the help, the ray that was in the picture died this morning she was in my tank for about a year with no problems, RAYKEPR you were right about the salt, some of it fall on the disc of another ray and it appears to burn the skin on it. kind of a big white spot. i feed my rays with frozen bloodworms and shrimp i´ll try on something alive. thanks anyway. another one is infected , think she´s going to die also. do you think is contagious?? because my two males aren´t infected and i have them in the same tank

