I would say that both your LFS
and the online shop get the live rock from the same place. I have got my LR
from both sources. I would suggest that if you can get the LR
shipped fresh (you are home whrn it is delivered, and the tank is eady to recieve it), then go for it.
If you would like to learn from 1 mistake that I made; I would suggest that you give it a fresh (RO
) water bath before you place i into the tank. The most unwanted thing in your tank I would say is a mantis shrimp (look up Google).
These little buggers eat your fish DEAD!!! A 1 minute dip of your rock will see them scurry out of there homes and into the water. I had 2 with my online purchase; 0 with my LSF. Hope this helps. Dipping in RO
water will not cause any other problems (it does not have to be warm). Remember as part of the cycling process there are a lot of organisms/creachers that will naturally die off and help increase the ammonia levels for that all important bacteria growth.