1000 Gal. tank? ...Uhm.. that's a pretty big tank. You'd need like, a store-sized space to even accomodate it. Where you just wondering, or are you seriously considering? If you were to make a stand so that it wasn't just sitting on the glass/acrylic, you'd prolly have to make it out of concrete and rebar, so it'd be in one area permenately, hence the weight. (1 gal. of water = 8lbs. 1000 gal * 8lbs/gal = 8,000lbs. 8,000lbs. / 2,000lbs. = 4 tons.) That's an unbelievably huge tank.