So I was thinking of building a trapazoid tank for a corner of my living room to tie two other tanks toghther. I was going to have the front viewing window be 3' wide and 5' high with the back side being 8' wide the overall tank height would be 6' high. This would bring the volume to around 600 gallons. My question is this. How thick should the glass be for a 600 gallon 6' high tank be? I cannot seem to find any caluclators that would help with that height. I do have access to relativly cheap piece of bullet proof glass from a bank that is 3x5 but I am not sure it would be thick enough. When in doubt I know MFK has the answers.