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					Originally Posted by  SeaHorse_Fanatic
					 
				 
				He's talking about Mag pumps or their equivalents. I've always been told that valving off Mags & similar pumps is a no-no. I've never done it so I have no personal experience of it causing a pump to fail. If I'm wrong, then I apologize for passing on bad info. However I was told this by several experienced reefers. 
 
Anybody valved off Mags or similar pumps on here & if so, what has been your experience?? 
 
Anthony 
			
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 Anthony,
I bought a Mag 5 but returned it for the Mag 7.  What's the optimal number of times a tank needs to circulated?
I'm setting up a 45g cube with a 25 gallon sump.
Thoughts?