I am not sure what You mean as in the tank as in all 4 glassses or just a single pannel but
The Dubai Mall is an insanely large shopping mall, located in Dubai UAE, But most fascinating of all is the 10-million liter Dubai Aquarium tank, located on the Ground Level of The Dubai Mall, which is the largest suspended aquarium in the world.
The main Aquarium tank, measures 51 meters (167ft) in length, 20 meters (66ft) in depth and 11 meters (36 ft) in height The Acrylic is actually 70cm thick. It houses over 33,000 aquatic animals, comprising over 140 species. Over 400 Sharks and Rays live in this tank, including the largest collection of Sand Tiger Sharks in the world.
This tank has surpassed the Chirabumi okinawa Japan as the biggest Pannel Aquarium the World, which is famous for housing 3 Whale Sharks and Manta Rays.
Both the Acrylic pannels were manufactured by the same company they are the leading in this field as they have discovered a adhasive which is completely transparent which joins all the layers also they use a process which assembles the pannels on site to achieve this amazing length. I saw a program on the making of them both on discovery channel.
I hope this helps
The Dubai Mall Aquarium
http://www.youtube.com/watch?v=Puzq70LmTdQ
Kuroshio Sea, Okinawa Japan - 2nd largest aquarium tank in the world
http://www.youtube.com/watch?v=u7deClndzQw