To me it seems to be a brain issue.  I'm wondering if has to do with the pH change during shipping or perhaps hypoxia.  As far as I can see there is no pathogen.  He has some skin flukes, but I've never heard of them causing blindness. 
		
	
		
		
		
		
			
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				600 gallon Plywood mixed Reef tank Heavily stocked with Tangs.
			 
		
		
		
		
	
		
		
	
	
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