How about some science. I know you guys have these great formulas to figure this stuff out. I am confused as to the flow vs, heat added to system thing. The Hydor is supposed to flow sim to the Ehiem 1250 (don't know if that is true, seems too small) and uses 23w while the mag3 uses 35w. Taking into account that there is 2 1/2' of hose and a low rest (I think) WB & rad as well as res (similar to
http://www.procooling.com/articles/h..._with_h2o1.php - but 1' long) and the flow vs watts how can I figure out which pump is better. Please help I can't trust myself because I come from the school of bigger is better so I wanna stick this big ass 10 pound mag3 in my case.