[NATIVEVAMAN]

It seems to me that what youare trying to do is run a sort of closed loop.Doing that with a sump is only partially effective.Before you get the flow you want you will surpass the returns capapbility to keep up.If it was me I would consider a true closed loop.Simply put you drill a hole in the back of the tank that feeds the suction side of a pump,then goes back to outlets in the tank.Closed loop systems can generate some amazing flows.They are not without there problems but they arnt rocket science either.