[And there you have it. I am about to replace my return pumps with one of the pumps from Harbor Freight since the mag 24 is shot. I will use one return pump for both tanks and then use my mag 9.5 for a closed loop on the 100g. I am also adding a kent float valve to the sump that will be gravity with top off water from a 20g rubbermaid sitting on the kitchen counter behind the tanks.]