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Looks like mucus buildup which may be first stage of Brooklynella. You can give the fish a 5 minute freshwater dip in tap water the same temperature to offer temporary relief and also see if the buildup reduces.
Would you happen to know how fast that can effect them? I've had no issues with them and didn't add anything to the tank for two months. Then I added coral today and noticed that on him about 6 hours later.