[Glimmerman911]

dfwatson, you probably don't need that much flow through your overflow though, if you are going to use a closed loop for water flow.

Get a barracuda or hammerhead pump for the closed loop, then just use a mag7 or similar for the sump return. You don't need that much flow through your sump, just enough to heat the water, and feed the skimmer. Keeping the flow through the sump slower will help keep microbubbles down, and it sucks having to redo your system because of microbubble problems.