I stopped by my local plastic fabricator for a few pieces of pvc sheet. When I got to talking to the guys about all my tanks, they showed me one of their "projects". It was a truly monster tank built for Jellyfish. Measured 10ft long x 2-4ft wide (its a bowfront) x 5ft tall. Roughly 1200 gallons built from either 1 or 1.5" thick acrylic. One slight problem with it: the back panel failed. Not a seam busting, but it looked like a broken window with shards in the corners. I have never seen acrylic fail in that way before--so bummed that I didn't take a photo for you all.