The second valve you turned (the white one) in the first video, is that to redirect the flow from the return from the DT to the "siphon/Sucktator" and if so how do you keep your sump from overflowing when vacuuming the DT?
I REALLY like you idea and about to rework my plumbing and place my sump and gravity return fuge to the room behind my tank so your timing it perfect. I just want to make sure I'm not missing anything...