Should you move the sand? Only if you want sand in your new tank LOL! !@ ! I don't think you'll have any problem with or without the sand. At worst you'll get a mini-spike, you know, a slight bump in ammonia or nitrite, but as the media in your canister are full of beneficial bacteria, they won't have any problem building up to handle the demand. Just monitor the ammonia and nitrite for the first few days, and if you see a spike, just change water more frequently and double up on the Prime, or whatever de-chlor you use. No worries.