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					Originally Posted by  JDigital
					 
				 
				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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 wow, really?  2 mp40's???  As far as LPS go, I have a Fungia, Favites, turbinaria reniformis (hard to figure out where to put that one, it's not quite an SPS and not quite an LPS, probably more like an SPS though) , I just discovered I have an encrusting Goniopora (didn't know what it was before), and my only softies are a Cladiella (my wife likes it) and zoas.  The rest are montis, acros, porites, styos, seriatopora, a couple of echinos, and the like.  Oh, and I have a couple of photosynthetic gorgonians as well, and some gsp and a tubipora.  And 2 clams.... gee I have more stuff than I thought, all piles into a 33 gallon right now!