Moving the sand bed is going to put a lot of nutrients back into the water. Its not a big problem but I would suggest you plan for it. You're tank may go through a mini-cycle like what happened when the tank is new. It can be handled by frequent, large water changes, aggressive skimming, running carbon, and running phosphate absorber. I usually plan on stocking up my herbivores a few weeks after the move to nip an algae bloom in the bud.