I'd say you are quite safe with the build. Seeing as you are only measuring the pane length where it's framed in and not the overall length. Even an all glass aquarium with these measurements would be fine. I only did the calculations for the panes.. not the reverse calc or the weight..
Also, the tank is roughly 165 gallons. A=pi*r^2 to get the volume multiply your answer by the height. So, (A=pi*24^2)20 which equals 36205.71428571425 cubic inches. A cubic inch of water is equal to 0.00432900433 gallons so the tank would have 156.734694 if it were a true cylinder. This will actually have more because of the octagonal shape. I guestimate 10 to 15 extra gallons of water.

Also, the tank is roughly 165 gallons. A=pi*r^2 to get the volume multiply your answer by the height. So, (A=pi*24^2)20 which equals 36205.71428571425 cubic inches. A cubic inch of water is equal to 0.00432900433 gallons so the tank would have 156.734694 if it were a true cylinder. This will actually have more because of the octagonal shape. I guestimate 10 to 15 extra gallons of water.








