I have six angles that were doing fine until a couple of days ago, one is now showing signs of fungus. Are angles susceptible to mouth fungus. If they are and Kink has this malady, what do you suggest we do to treat it. We tried to cure a Powder Blue Guarmi and lost it in the end. Were ready to go out and get a new tank to treat sick fish and keep live food. I just want to make sure that we save it. 