Someone correct me here if I'm wrong but when you add the live rock, won't your tank begin the cycle again?
If it is uncured LR
, yes it will need to cycle. However, most LFS
offer cured LR
for sale. If you could transport it in water (and *if* it is really cured) you could put it right in the tank with no problems.
Personally, I would feel better if I put it in a separate container for a few days cured or not so that I could check it for ammonia. Just in case...