Well, my 135 gal glass takes me and one of my sons to get it up off the floor and move it when empty. I would think with water, stand, substrate and decor/equipment, you would be pushing 1500-1600 lbs. Depending on the amount of surface area your stand style has to transmit weight to the floor will also come into play.
Even though most on here will not recommend two Oscars in a 100, I know of many folks who have done it for years without any ill affects. You do have to have good filtration and maintenance routine though. ANd two oscars that get along with one another.