Using my sandbed from old to new tank?

[Myka]

IMO, don't reuse the sandbed unless it is a very shallow sandbed, and the tank has no nutrient issues. The trouble is that with deeper sandbeds (even 1") there are so many critters that are living in the sand that when you move it many of them die (get crushed) and cause a cycle.

If your sandbed is over about 1/2" I would suggest you buy new sand, and add maybe 6 cups of your old sand (siphoned from the very top layer of the old sandbed).