I would just leave him alone, try not to further stress the fish.
I, as with many, believe ICH is always there. This is an ongoing discussion, all of us with our own point of view. I don't worry about quarantining. I purchase my fish only from LFS that do their due diligence in treating, feeding and only letting the fish go for sale, when ready. These stores do exist, and I have only ever lost one fish due to disease.
Sorry to hear about your beautiful fish, I think it will be ok.
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Setup: 180G DT, 105G Refuge (approx. 300lbs LR, 150lbs Aragonite)
Hardware: Super Reef Octopus SSS-3000, Tunze ATO, Mag 18 return, 2x MP40W, 2X Koralia 4's Wavemaker
Lighting: 5ft Hamilton Belize Sun (2x250W MH, 2X80W T5HO)
Type of Aquarium: mixed reef (SPS & LPS) with fish
Dosing: Mg, Ca, Alk
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