I don't think you know what you're letting yourself in for. Take an upright tank that's a metre wide, a metre deep, and two metres tall. That's two cubic metres of water which will weigh 2000 kg, or two metric tons. The glass has to have a safety factor built in. For the above tank it would require glass that's 30mm thick, and the glass itself would weigh just over another 1000kg, making a total weight of over three metric tons. That three tons would be sitting on a floor area of one square metre.
For a different size and shape of tank, you can work out the figures for yourself on a website such as this one...
http://www.theaquatoo...uilding-your-aquarium