Really? They had a massive tank built there that they've had for 14 years they said. VERY nice looking 3 feet high x 5 feet wide with 1/2" thick glass cut to 45 degree angles sealed with silicone. Looked great. Said they've never had a problem with it. I did mention it to them because I notice on all my tanks it's overlapping and on all the DIY tutorials it says to overlap. They said 45 mitered angles were the way to do it. But seeing as how all the other tanks out there aren't mitered, I think you're right Nate.
BTW, they had some nice fish in there. Big bala sharks a huge pleco (14+") and 2 parrot fish I think is what they're called. Very nice setup, but they had a bunch of undergravel filters with powerheads rather than a wet/dry. They said the tank cost $3000 total.