Interesting, thanks for posting ID.  How did you go about IDing it?  Just picture match or something more scientific? 
 
It looks a lot like an algae that I had in my tank for the first 6-8 months of setting it up.  It eventually just went away on its own as nutrients were lowered and the tank matured.  I added a Tuxedo Urchin as well who seemed to eat it a bit. 
		
	
		
		
		
		
			
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				~ Mindy 
 
SPS fanatic. 
			 
		
		
		
		
	
		
		
	
	
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