33 gal is a little small for a pair of clowns... 
You will definitely want to keep up on water changes. 
 
I would say a 5 gallon bucket every week or two should keep you on top of nitrates. 
 
Skimmerless and sumpless, are you going to add a dsb or have a significant amount of LR? 
		
	
		
		
		
		
		
	
		
		
	
	
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