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This is the best I can do. He tends to stay near the glass so can't get the light on him. Looks like a black crater.Can you get a clearer photo, taken under white light instead of blue?
Did this come on suddenly, or did it develop gradually over time? Six years is pretty old for this species (probably max out at around 10 years). Some male wrasses are prone to odd changes in color and their skin over time, I suspect due to a buildup of sex hormones in the water (but that is unproven). If this change occurred over a few days, that isn't it though.
Jay