Any time I have done a tank transfer, I:
Remove the LR first, making sure it is submerged in tank water. If it is a short distance and time between setups, then a powerhead or bubbler isnt really needed. Other wise, you need to keep the water oxygenated through surface agitation, or the bacteria will crash.
Coral attached to live rock can be carfully bagged, or set in egg crate in the bottom of their own buckets.
All non agro fish go in their on 5 gallon bucket. All agros in a seperate buckets, shrimp and snails in a seperate bucket, and crabs/hermits in their own bucket. It is ok to put multiple hermits in one container. From there I try to save as much of the tank water as I can.
Your replacing the sand, which is a good move on your part and will save you trouble with ammonia spikes from stirring up the crap that settles on it. You will experience a mini cycle though with new substrate, so just mind your water qaulity.
Make sure you keep your water at a stable temperature as best you can. I also like to have about 30-40 gallons of premixed saltwater stored the night before the move for just in case. Nothing sucks worse the making big batches of saltwater when your in a hurry.
Keep in mind that you will need to reacclimate your fish. Water parameters will not match at all (in most cases anyways). So temperature acclimate and then drip your fishies, inverts, corals, etc....
It sucks, but take your time and everything will come out fine (or close to fine).
