I have an 8'L x 4'W x 3'T acrylic tank that was donated to the center. It has a center overflow column (7" x 20" x 32") and two top access ports (20" x 30") located at either end of the top. It's made from 1" thick acrylic. I'm interested in finding out the manufacturer of this tank because I want to do some major structural modifications without compromising the integrity. For instance, I'd like to enlarge the access ports on the top to the maximum size for easier access and for better light penetration.