Genuinely sorry, ScubaSteve-- the man was just rude and insulting and I don' take well to that.
Back to the butterfly-- assuming your water parameters are all good-- and they are spot on-- the only idea I can suggest is removal to a QT for treatment there. There's clearly ich in the tank; if you want to get rid of it, that means putting all the fish in QT for at least eight weeks (six months is ideal but who wants to wait that long?) and leaving the tank fishless and therefore hostless for the ich.
Some people suggest raising the tank temp to 84 degrees to speed up the ich cycle-- that will help burn it out within the eight week time frame, if the corals don't mind. do it slowly though, both raising and lowering back the temp.
As for the med to use in the QT, I still suggest Cupramine. With the appropriate caution.
If you can rid the tank of the ich, the butterfly's stress won't be able to bring on an infestation, which exacerbates the stress. And if all the fish are in the QT and then are re-introduced to the tank at once, there will be much less territorial stress, after the initial "my spot, your spot" staking out of preferred real estate.
It's a lot of trouble to go to-- especially fish-catching! But it should work.
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125 gallon reef, vertex 200 lights, 40 gallon sump/refugium, 2 Deltec skimmers, Mag 12 return pump, Koralia 4 Wavemaker.
(125 gallon freshwater discus planted tank. 40 gallon discus spawning tank, 35 gallon discus spawning tank)
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