[bertoni]

I suspect that if you are careful in moving the live rock, the tank will be fine with new saltwater. It's best to match the SG fairly closely, and keep the temperature in a reasonable range, but I'm not sure that's as critical as many people think. Exposing live rock to air always has some risk because die-off can and will occur. I'd watch the new system for traces of ammonia, and keep water for changes on hand, as well as Prime or Amquel. I've moved tanks in the past, and had minimal issues. I was careful to keep the live rock in water as much as possible.