So in my town, they're tearing down the old High School, and all the Students are going to a NEW high school (me included. New school on my Senior Year, rofl). I went by the old school today on my way to work and saw something laying on the ground, by the trash piles. For whatever reason, who knows, who cares, they're throwing out 6 peices of 7/8'' thick glass, each 6' x 3'. I figured, hell, that COULD be a cheap tank. So I asked the workers if they would give it away, and they are. I took it home in the car (top down for them to fit, pouring rain, but I got my glass!). So would this be thick enough for a tank? How many gallons would this be? I'm far far from an engineer, so what would it take to put this together into a tank? Would it be as simple as siliconing it all together, and letting it cure? My main thing is the first two questions; is it thick enough, and how many gallons would this be?