Ya I looked this up earlier and now I have to get one of these!!!! The ones I saw on seachem's site pulled from two places, the usual deep tank pull and a skimmer-like pull at the water line and there's independent control of each!! OMG, so awesome!!!! It's on the "to buy" list. Haha.The tidal filter was fantastic! It was just a regular hang on the back filter but it pulls water from the surface rather than down low in the tank. It helped me avoid the gross slime that built up.