I know of a 1000g tank here in northwest Arkansas It may be 1,200 but I haven't measured and done the math
I bet thats a maintenance nighmare, I saw this thread called reefzilla and this guy has a 17,000 marine aquarium in his house. He said he was planning make a 60-80,000 gallon marine aquarium next.
C'mon up! Our local club has been helping out with the tank and we are trying to get it back to where it should be. It used to be amazing and the building it was in changed hands to a non-profit organization. Maintenance has been almost non existent for a few years. It's not much to look at currently but we are working to make it better. This is my signature