I have to replace glass on my fishtank due to a crack.How difficult will this be?The tank is 200 gallons.?

The sheet of acrylic I need is 6 feet by 2 feet. It is the bottom of the tank that cracked.How hard will this be to fix and is it possible to fix it? I don’t know too much about fish tanks but it cracked because of too much pressure when we tested it with water. We build a better stand for it to take pressure off the glass. does anyone know about tanks? I want to try fixing this, but I don’t want to spend the money and then find out it wont work. ANY ADVICE???
Jenna