I have two small angelfish in a ten gallon tank (I know, too small). they have a small amount of white fuzz on top of their heads (where the hump is on the male). Should I use a fungicide, and if so, which one? The other fish (four neon tetras and a small cat) don't seem to have this. thanks for your help!
BTW, this is a new tank, less than a week old.