This is a discussion on Need help please! within the Tropical Fish Diseases forums, part of the Freshwater Fish and Aquariums category; -->
Good luck- I know how much you love your boesmani!...
UPDATE:
So I've done 2 full courses of treatment with the Furan-2 (4 days per course with 25% water changes every 2 days). The Congos are cleared up. One Boe is completely cleared up and one has just a tiny spot left on his lip but the third one still has some fuzz on his lips but it is MUCH better. Should I continue with more Furan-2 or just clear the meds out with water changes and keep on eye on it?
I would say continue until there are no more symptoms. Also, if you haven't already, raise the temperature, as this will speed the life cycle of most bacteria.