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I have a couple of questions for the experts here. I am in the process of setting up a 125g tank. I have the sand in now and will add 180 lbs. of LR on Friday. This tank is going to be an upgrade from a 65g I have that has been running for 9 months. The question I have is when the cycle is done...

Newbie here. I purchased a Cpr 100(700 gal) overflow box. I used a Mag 9 (950 gal) pump for my return pump. It was recommended by the LFS. It’s about a 4 foot return to the tank with a few 90 degree bends in it. The problem was that the return pump was returning water faster than the overflow...