at a recent job I was given 4- 4ftx7ft sheets of 1/2 in glass, it was used as dividers between cubicles. i have considered a DIY tank for some time, could i build a 7 x 36 x 24high? with this glass, I have disassembled tanks and sealed them so im not nervous about that, just the strength of the glass, i see many tanks with tempered bottoms which this glass is not.