This is totally RAD!!! I started looking around the web for information about keeping a reef without doing waterchanges. All my parms are at zero and I started wondering why i was waisting not only my time with water changes, but salt, and the worlds most precious resource... clean water.
Since you dont do water changes, I assume you add supplements. Is this correct? If so, would you mind sharing what sort of supplements you add and how often?
It took me a minute to figure out how the water was getting sucked up from the bottom of your overflow, but i think I understand it now. Is it simply based on the fact that the pipe is below your water level line, so the down pressure of the water is forcing it up the pipe? Thats ingenious dude! Did you design this on your own or did you take this design from somewhere?