The glass ran me about 100 dollars from a place called Glass Doctor, in Tulsa. This is really cheap. I told them when I have the tank completed I would give them some pics to hang on the wall in their lobby, for advertising that their glass is not just for windows.
Don't try to put together by yourself. You really need some extra hands. My wife helped me. After putting a bead of silicone down, she held a pane in place while I ran the beads and placed another. Then that's where the tape comes in.
They did an excellent job cutting the glass, so everything was good and square, and exactly the right dimentions - this is a must for a good fit.
The cabinet has a steel angle frame inside, and will hold the weight with no problem.