It's a Koran, not Korean - as in someone from Korea, angelfish. 
  
Yes, it's probably the Koran eating your zoas. They are non-reefsafe fish. Coral & sponge & clam eaters. 
  
Anthony 
		
	
		
		
		
		
			
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				If you see it, can take care of it, better get it or put it on hold. Otherwise, it'll be gone & you'll regret it!
			 
		
		
		
		
	
		
		
	
	
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