Moving a 120 gallon reef about 10 feet

[HaZRaTTy]

I would think that if you are only moving the Tank and putting the water directly back into the tank you will be fine. I would also suggest that you move your LR into your 20G buckets of water while the move happens. Less weight and less die off.

If your tank is fairly new your sand shouldn't have any gas buildup and if you wanted and are worried I would just keep down on the sand agitation while you put your LR and water back in.

Should be an easy move 10 feet away, good luck.