Without hurting my ability to sell off these pumps here or on the "other" site, I think I have already made my decision. I talked to Bruce today at Aquatek, and I will be starting by getting an Ehiem 1272 from him tomorrow for the tank/sump return. I would be getting 2 Tunze 6100's and the Multicontroller 7095, but he and Tunze here are out of stock for the next couple of weeks. I'm going to try to make up the flow with a couple of Mag 4's I have. If that doesn't work, and I can't wait a couple of weeks, I will order the Tunze's from Marine Depot, unless anyone has one or two they want to sell.
I have seen, experienced, and now dealt with closed loop systems , and have painfully realized they are not for me.
Stephen