<a href=showthread.php?s=&postid=9445541#post9445541 target=_blank>Originally posted</a> by bbehring You want about 3x - 5x turn over in the sump. Probably about 600 - 800 gph. Depends on what size your sump is to deremine your needs.
I'm not sure you'd want more flow through your sump then your skimmer can handle? To much higher and I dont see the point. I dont think the idea of a sump is to shoot water through as fast as possible. I"m running a ~2x and wouldn't want anymore.
<a href=showthread.php?s=&postid=9429261#post9429261 target=_blank>Originally posted</a> by I am a giraffe I think Melev has plans for an overflow box that doesn't loose suction. I was in the exact same situation you're in; I ended up drilling two holes in the back of the tank.
Without the plumbing and tubes going up and over the tank I ended up with two clean bulkheads. I figure if I had to DIY something I may as well drill some holes rather than mess with bending, cutting and gluing acrylic. The hole drilling is a piece of cake by the way, just make sure your sides arn't tempered
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