I do have a pleco in the tank and I had thought that he may have done
the damage. I am aiming to trade him in once I can catch him, they are
surprisingly quick. I agree that doing a preventative treatment on the
healthy fish is probably not a good idea so I am not going to do that.
I have been doing water changes pretty regularly. As far as the other
conditions, this tank has been set up for years and I haven't had
problems before these angels. My theory on this situation is: in my
concern about the possibility of ich or parasites I raised the
temperature of my main tank also. Having the temperature up at 82F
stressed my angelfish that is now sick and he either developed this
fungus or was inactive if the pleco started to chomp on him. I
previously had not used the heater since my house stays warm enough to
keep the tank in a healthy range (over 72F). So the moral of the story
to me is that I need to follow my normal hands off approach to the tank
and only fix things if they actually happen.
I appreciate the help that y'all have given.
Thank you,
James