I moved my 40gal fairly easily last year. We removed 1/2 the water, but left in all the corals that were still below the water line. We got these moving discs from Home Depot that worked great. They are a white disc with some black foam and the heavy object(tank) slides across the floor to the new location on these things. They were $10 or so for about 4 of them. You need a few strong guys to gently lift the tank an inch or so up so you can slide the disc under. We put one on each corner of the stand. We just slide the tank slowwwwly to the new location. It worked for me.
Sheryle