I currently have a drilled closed loop powered by a Pan World 50PX-X and my sump is returned by a Iwaki WMD40RLTX.

I would like to do more flow in my tank, with less electricity, and less noise.

I was wondering if I could get a larger centrifugal pump like the dart or ampmaster and use it to run both?

So I would connect the inlet on the pump to the closed loop and the sump output. I would control the amount of water coming from the sump with a ball valve.

Sound ok? Bad idea?

The closed loop is 1" and the sump return is 1". If I used an amp master 3000 what would my flow be in the tank?