This is my new 180. That has sat in my garage since May of 07. I have been trying to decide on how to cover the overflow towers with some type of styro background. Thought of using some concrete to cover after the carving is done. The dilemma is hiding the towers without looking like I am hiding the towers. I also have to leave access to the front of the towers because of the vents located at the top middle and bottom of both towers. These will surely need to be cleaned periodically. I will obviously be using a sump. More than likely a DIY style from a rubbermaid tub and a drawer system. I am also not wanting the BG to continue over to the sides of the tank. Dont want to see "unfinished" styro from the sides. So the BG will have to surround the tower and some how curve back to each corner. There is not much room from the corner of the tank to the edge of the tower.This leaves me with the feeling that my BG will bulge out around each tower. And creating the look that I am only hiding some thing. And that is exactly what I am trying to avoid. I also dont want a thick BG that will only steal space from the tank. Anyone with built-in overflows and a DIY BG your advice would be greatly appreciated. Thanks.