Depending on the age of the sand bed and how well it is maintained, you might want to gauge the re-using of the sand by the smell as you remove it. I have always re-used mine but I know some that have not. I have moved mine 2x by scraping the top layer about an inch down and keeping it separate from the lower sand. Always smelled like seawater when removed though. If it smelled foul, I would not reuse it. I would guess you would be having issues now if the sand bed was too bad but I wanted to just throw that out there.
*180 gal Display, 100 gal basement sump, 33 gal refugium, 3x250 MH, 2x160 VHO actinics, zoos, some softies, LPS & lots of acros and other SPS.
*100 gal prop tank plumbed into main system w/ 2x96 PC lights and 1x150 MH,