you be ok with a Cbb. Mine 26g and I have a Cbb and a large Naso. My rule of thumb is 1 fish for 5 gallons. Lol 
 
I noticed two aprasias in 
My tank so I added a cb peppermint and befor it hit bottom the wrasse had shrimp breath.  
 
Got rid of wrasse now have to go back to store 
		
	
		
		
		
		
		
	
		
		
	
	
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