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Looks like velvet. Act fast. It wiped out my whole tank (8 clowns, 3 tangs, 1 angel) in a day.
+1 Fresh water dip ASAPI think you’ve got velvet and other issues, including ich and perhaps something else. I’d do a freshwater dip ASAP followed by copper treatment. He doesn’t have much time... methelyne blue in the bath would help soothe the gills
For future reference, you can use a hang on fish keeper filled with RO/DI and put it on the inside of the tank with an airline until the fresh water matches the tanks temp near identically. No heater needed.I'm going to put some water bottles in the microwave then set them in my container to raise the temp of the water because I don't have a heater small enough for the fresh water dip.