I myself tend to leave things and if the tank is in good shape, parameters are GREAT the fish usually fight it off... I have had ICH outbreaks, but never lost a fish to it, and I have never treated them.
Others will most likely say, since you have it in QT that you should Hypo Salinity it... and even use copper... Research these methods as they do work well if you do treat.
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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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