RBTA-go for it !
			 
			 
			
		
		
		
		I have the same setup - 20 gal with 130pc light, put in a 2" rbta about a year ago, now over 6" and is host for a pair of occellaris clowns. Mind you they didn't go into it for months, then one night they both went in and have never left it since.   
Gazza 
		
	
		
		
		
		
		
	
		
		
	
	
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