I would not reuse the sand, it will contain a lot of trapped detritus that if released could start a new cycle, killing off all your livestock. Start fresh with dry sand. Be sure to wash the sand well before using it. To wash the sand place 5 pounds or so at a time in a 5 gallon bucket. Use a garden hose at full flow to agitate the sand. The finer grains of sand will overflow the top of the bucket, leaving the larger grains behind. Continue to agitate the water until it runs clear. I would not use "live" sand as it can contain more dead than live organisms and has the potential to start a new cycle (and cost more to purchase since you are paying for water). Try to reuse as much clean water from the old system as possible to lessen the shock of new water chemistry on your livestock. Once the water from the old tank starts to get murky from stirred up detritus, don't reuse that water. Have plenty of new premade and preheated saltwater on hand to make up for the lost water. I would plan on pre-making 50% of your display tank's volume and have it ready for use. 5 gallon buckets with lids are your best friend for a tank move. Anything larger becomes very heavy to move, although for longer moves ice chests work well at maintaining water temperatures. You can use bubble wrap to help keep your rock with corals attached from being smashed against the sides of the buckets during transport. Start by filling three buckets 1/3 with water from the tank and then add the rock from the system to one of the buckets. Continue filling buckets first with water, then rock until you have removed all the rock. Save a couple of half full buckets of clean water from the tank for the fish. Once all the rock has been removed, the fish should be easy to catch. Some fish will burrow into the sand to hide so if you come up short on your fish count you may need to sift through the sand to find the missing fish. Once you have everything back at your home and the tank in place, first set up your rock. Try to minimize the amount of time the rock is out of the water. If aquascaping the rock takes you awhile, pour some of the saltwater from the old set-up on the rock to keep it wet. Once the rock is set fill the tank with all the old water and whatever new water is necessary. You can just dump the fish directly from the buckets into the new tank to prevent injuring the fish or adding stress to the fish by netting them. Then start circulating the water, get the heaters running and the rest of the equipment. Tank moves take much longer than one would first suspect. Plan on a very long day. Best of luck and keep us posted with your results!
