I just had a thought, are you sure it's ICH?
You said you just added sand to the tank! Many fish have a Mucous coating and you may just be seeing some fine sand particles that have stuck to the fish.My Orchid Dottybacks get slimed with all kinds ok of junk on them from diving in and out of the rocks all the time.
Another way to keep amonia and nitrates down in the Qt is to siphon out any remaining food that falls to the bottom uneaten, and fish poop.A Turkey baster is good to use.
Be sure to put a couple of small pieces of pvc (elbows are good), to give the fish hiding and sleeping spots.Good luck.
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