Not ideal to set up a tank in a day even with live rock. But i quess you have no choice,
When you move the old tank i would get as much of the old water as you can and put it in the new tank.
Before you add the corals and rock, remove about 30% of the new water into buckets and fill the tank up with the old water.
Get a refractometer as the swing arm things are rubbish.