So i stopped by my LFS today and saw that in their main display tank they have quite a cool overflow. So basically, a drilled tank, and it comes up with a PVc tube, all the way up to the water level, and at the water level, is a full circle with teeth around it like a corner overflow, and the water flows into that. do you know what type of design this is? i dont have a picture but i can whip out my PAINT skills if you dont get it lol