Iodine for Angel Fish fungus?

I have never heard of someone using straight iodine in a tank to cure fish ailments. I have heard the suggestion; but due to the wide Ph range available no real specifics can be given and is discourage since medicine on the market have the buffers needed. It sounds like isolation would help and would also allow the medication to only be given to that fish (unless all are effected which it doesn't sound like) and will also keep it from being stressed and picked on since it is having more trouble. If you want to try the fungus remover again you can run a non carbon filter there. Also I suggest taking it to a nice pet store and asking for an exact diagnosis; that way you can get the right meds and know if the tank might be infected (gravel may need boiling, etc.)