I would have twice as much saltwater mixed and ready at home for the move. Bagging everything up and trying not to disturb things is the challenge. I would bag the top 1inch of sand and call it a day...empty the tank. I would pick up a couple of 20gal rubbermaids and put the rock and corals into them with powerheads and heaters until you have the display set up. I would use all the old tank water and mix in new saltwater. At some point, you want the water in the new display and the rubbermaids to be about the same chemistry. Once the display clears, you should be able to put all the corals and fish in without much delay. Good luck!