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How old is the tank? Is the tang new to your tank? Or have you added anything new to the tank?
+1
Also, does the tang seem to be hiding from the lighting? Swimming into the flow of your powerheads? Have your fish ever been treated for flukes?
Almost anything "wet" can bring encysted ich or velvet tomonts along with. Velvet sometimes attacks the fish's gills without much in the way of external symptoms. Spots from ich or velvet can be easier to observe under blue lighting - have you looked at the tang under that sort of lighting?
~Bruce
If it is velvet, all of your fish are at extreme risk. Velvet is rampant in the aquarium industry.At least none of my other fish are having any problems. Thanks


