I work installing security/surveillance/alarm systems. Currently I am working on a residential house(cough...mansion...cough) and in this guys guest dining room he has a tank that measures roughly 20 feet long, 4 feet tall, and 32 inches from front to back. That comes up to just about 1600 gallons. He is paying someone 10 grand to setup the tank with a reef. Pretty incredible. I'll try to sneak some pics when he gets this thing running.