1 gallon of water weighs like 8.3lbs so 200gal would weigh like 1660lbs, plus weight of stand, sump, tank, and all the extras. Like 2k-lbs. A typical 150 has a footprint of 5'x2' = 10ft sq. The pressure would be like 166lbf/(ft-sq). You would need a civil engineer to let you know if this is...