My occellari clownns won't have anything to do with my RBTA.  They actually prefer the inflow piping for the filter.  
 
However, I just picked up a Clarkii on Friday and it took to the RBTA within putting the fish in the tank.  I've heard that Skunks will take to RBTAs very quickly as well. 
		
	
		
		
		
		
		
	
		
		
	
	
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