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From my experience, any time you see an area of pigment loss, suspect marine velvet and treat for it. A heavy bio-load like you have would allow for very quick spread of a disease like marine velvet. You don't always get spots on a fish from this disease. Like ich it often attacks the gills first and the fish die without a mark on them.
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"The good thing about science is that it's true whether you believe it or not." Neil deGrasse Tyson
Current Tank Info: 90 gallon reef tank
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