Could it be done?
Sure, anything can be done.
However, you would want a building built around it, a full staff of caretakers, a budget that would feed an entire third-world country, and improved technology.
According to our calculator, a tank that size will be about 13,464,935 gallons, so you'd need a bit of water as well. At least you'd be able to claim the world's largest aquarium, as the current largest is 3 million gallons ( http://www.sheddaquarium.org/
). There is one that is being built by a billionare that will be 5 million gallons ( http://news.yahoo.com/s/chitribts/20...erkettleoffish
). It will be done this fall. The fish, including two whale sharks, are all being transported by UPS--I wonder if anyone had to sign for them