1 gal of water weighs about 8 lbs. so 8X90+100(LR?)+50 Misc.= Aprox 870Lbs So have a party or a frag swap and ask ten people to stand in the spot your thinking to place the tank If they dont crash the floor and end up down stairs your set.(LOL) I think most floors in big buildings are geared to hold up to more than 1000 lbs. Hay look at Vic he has a 180 lives on the second floor last I saw his tank was still in his apartment.