All but one of the fish have lost all signs of the injuries. On fish still has a growth but it has neither infected any other fish nor affected the behavior of the fish.
I am keeping a close eye on it though.
The tank was set up mid January and the rainbows have been in the tank about a month and a half. As of yesterday the remaining injured rainbow has almost completely healed.
Mine was noticably better this morning. The fuzz was quite reduced. Top lip looked different too ... more normal ... and I hadn't noticed it looking bad before. So I decided to go ahead with dose #2 of the Jungle Fungus Eliminator. Great stuff. All other fish seem quite happy.
? If so, I'll water change, reinsert carbon tomorrow am or even tonight.