My LFS doesn't sell these so I have been researching this all morning. I believe I understand the concept. I either need to supply water into the top or I connect a Tunze on the bottom and use the Wavy as a rotating device with no control of the amount of water that is pushed around. I don't think I like this idea or concept. With that said, what options do I have for a 125g bow front tank with overflows in both rear corners? How do I get water into the top of the Wavy? My sump and return pump are in the basement some 10' below my display tank and I only have minimal clearance from my tank to the wall behind my aquarium. I think I need to pullwater from the display tank. This means another visable hose and power cord. Any suggestions you have are greatly appreciated.