If I do sump would 1.5" overflows in each corner be good turnover?
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If I do sump would 1.5" overflows in each corner be good turnover?

It seems like a waste of space in the center for just the pumps. You could run both drains to the left and have long filter socks. Lots of bio media in the center and both pumps on the right. I have dual mag12s but they're dialed back with valves a decent amount.
Socks are all you need for mechanical, if you could do 50 micron that's quite clear. Make/buy a holder to slip them on and off and maintenance is a breeze. The drawers just make more places for detritus to build up.
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