Hi everyone!!! I need some help!!! I have a 55G fresh water tank. I've had it for years. But here recently, I have this poor fire mouth gourami that got a white patch on his head, It looks like a small cotton fluff. I have never seen this befor, so Im no sure what it is or how to help him get better. I know they are sad picks but its all I have. Any help would be much appreciated!!!