Put all your livestock in bags or buckets, cover rock in wet newspaper for transport to keep moist. If you've got a bunch of anemones, corals, etc. you can float them and what they're attached to upside down in a bag by attaching it to a piece of styrofoam. Siphon out most of the water, leave a little to keep the sand covered if you can move it with it in it. Move it and set it up again. Depending on how much livestock you have you may need to be careful reintroducing cuz your bacteria levels will be way low from losing all that water. Watch your ammonia spikes, and be ready to do water changes. If you want to keep your water you could use big trash cans to transport it in then you don't have to worry as much. Or water jugs, but if you've got a lot of fish i'd save as much of the water as you can. Moving tanks is a pain--best of luck to ya buddy!