Just a quick note for Tando Murphy and others, Silicone has an exceptional adhesion rate to glass, and despite it's pliability really has very little real give. In addition, if you actually look at the square inches of the silicone bead, and wieght of the water inside the tank, you will see that there is not that much pressure on the silicone in PSI. It is still scary, because it's a big bunch of water, but in reality if the beads are heavy enough, the glass was cleaned properly and the silicone given ample time to cure it will do the job. I was a huge skeptic the first time I ever heard this as well so I certainly understand the dis-beleif, but it really does the job and tanks are really that easy to build. I learned this with my first 55, I bought it leaks and all for $5 at a yard sale and then checked out a book on tank building. I was baffled at the idea of putiing it together with silicone only, and it sat in my garage full of water for 2 months before I would trust it in the house. I recently visited a tank building facility in Tennesee, and was truly baffled at the size and configuration of some of the custom tanks without rims or support. Silicone does not adhere well to acrylic though so beware cement is required with them
