The only safe way to move tanks is to set them both up and take 2-3 months, or longer if needed, to slowly move the rock, coral and fish from the old tank to the new. A vicious, quick cycle can happen if you disturb the oxic/anoxic parts of the rock/sand and all that it takes is one coral to die that will kill two more, then those two kill four, those four kill eight, and so on. You end up killing the bacteria that you need to help stave off the cycle... so the bacteria death fuels the cycle and is not around to work their magic - the worst possible kind of outcome. I know that this is hardly helpful now, but maybe it will help somebody else.
You can kinda get away with going fast if you move a tank and leave the bottom rock in the sand and just remove the upper rock, but even then it is risky. ...but then again, some people also have no issues moving a tank all in 1 day. I would not risk it.