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I have a 40 gallon breeder and an Ecotech Vectra S return pump. I was wondering if I am better off using the an overflox box from Eshopps that is small (600 gph rated) or or medium (800 gph). Head height, I am guessing should be no more than 3.5 feet if I use soft plumbing and probably 4 feet (including elbows). Not sure if any of that matters. Oh, and I will be using the return pump controller and a ball valve to control flow.