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Sciencing Daily
I think a mag 5 is sufficient, but you need powerheads. I like to shoot for less than 10x turnover through my sump, and with head loss Im looking at around 350gph I think. I also run it through a 1/2" sea swirl, so the flow gets to every area of the tank, coupled with some powerheads on my sps side, and I get some nice random currents kicking around. Also, as far as sump, always go longer rather than taller, the benefits are two-fold. First, it gives you more time to clear micro bubbles, and Two it gives you more room for equipment when (not if) you add more things.