help I need help with my diamond watchman goby. The bottom of his jaw was turning black and now when you look into his gills from the back they are pitch black. One is a little swollen and looks like a bubble that could be popped is coming out of it and its also black in color. Is this a tumor or something that has just developed over time filtering the substrate. It started on the bottom of his jaw getting blacker and blacker over the period of about six months. Is it irritated and in need of treatment or something a cleaner shrimp/wrasse can fix. HELP he isn't acting any different, still sifting the sand and eating. nothing else in the reef is acting different or seems to have been affected, but someone i know told me he tried this species of fish twice and this happened both times with his. one of his went from eating to sudden death the other went from eating to jumping out of the tank. seems common enough that someone might have an answer but i havent been that lucky. I am already soaking food in garlic