Original poster: "Michael S" <me-at-vduo-dot-com> I have some ½ inch lexan (a little thick, but the price was right) which I had planned on using in my primary. I had planned on spacing some ¼ inch copper tubing ½ inches apart, but I have never worked with lexan before, and I wanted to know (since it seems like a popular primary form) what other people had done in order to notch it. Thanks!