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			 Since you mentioned a SPS Dominated tank, I'm curious which softies/lps you are looking to keep...  
		
	
		
		
		
		
			2 MP20's would be 44x turnover + your return from the sump. 2 MP40's would be 71x turnover + your return from the sump. That's only of course if you are running them at 100%.. I think closed loops are great, I got one myself, but I just got my hands on a MP20, and I gotta admit, it is a sweet piece of kit! For you tank I would probably go with 2 MP20's plus your sump return. Only because you might have softies/lps... if it was 100% SPS, I'd recommend the 2x MP40 route. 
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	180G Office Reef. Started Sept 2012 http://www.canreef.com/vbulletin/showthread.php?t=88894 62G Starfire Reef. Started Jan 2013 http://www.canreef.com/vbulletin/showthread.php?t=89988  | 
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