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			 Usually white in coraline algae is an indication of growth or death. Any abrupt changes in tank chemistry that might of caused it? Other than than that the only thing I could attribute it too would have to be your urchin, they are known for it after all. 
		
	
		
		
		
		
			
		
		
		
		
	
		
		
	
	
	Levi  | 
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