Are we talking about the sump return, or a closed loop? I can't remember if you've said this already, so ... um .. sorry if I'm asking yet another question that's already been answered once before .... but, are you considering a closed loop at all?
The reason I ask this, I'm not really big on a lot of sump turnover any more. Obviously there is a minimum threshold. But the more the water rushes through the sump, the more you need to look at more dams and baffles and whatnot to prevent bubbles from reaching the pump intake, and becoming a microbubble nuisance in the main display.
To me, the ideal situation is a sump turnover that is "just enough" or a little more than minimal, and then making up the rest of the water movement through other means -- powerheads, closed loops or semi-closed loops (ie pump intake hidden inside the overflow).
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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