99% of the time is placement. Some of the best filtered tanks are done on low movement and flow.
I have a 135 with approx 600- 800 gph running through from my sump. 3 1" returns in different places along the back top of the tank. Overflows are both on 1 side of the tank. I have 1 powerhead running I do not vacuume the tank anymore. I do my water change through the sump.
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