you've heard it before, but how much flow?

[The Reefer91]

for my return pump. i am going to install a closed loop eventually and i'm going to be keeping LPS and softies. it will be a 180g tank.

[benray4fun]

anywhere between five and 10 times per hour turnover is the flow rate. If you have anemome's then stay on the high side, if not, then lower it.

[Anemonebuff]

I agree that 5-10 times an hour for your sump. The tank should have 20-30 times turnover in the tank for LPS and softies. 30 times plus for SPS.

[Alaskan Reefer]

What ^^^he^^^ said.

125 here -- 6.5X turnover through sump, 32X turnover in display (mixed with softies, LPS and SPS).