i had a leaflip grouper go blind after moving it into another tank. im quite shure it poisoned its self and the others i moved it with, i kind of doubt thats what happened to the tangs but it is strange that it would happen twice. 
		
	
		
		
		
		
			
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				but what the heck do i know
			 
		
		
		
		
	
		
		
	
	
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