Originally Posted by AquaRick
If you're starting a cycle, add in the rocks while the tank cycles. It will cure at the same time. Just an fyi, it will stink really bad for a few days during part of the cycle/curing.
+1 on adding the rocks during the cycle. For mine, I never did get any bad odors.
One thing I will recommend: Rinse these rocks thoroughly! They have a LOT of dust and small debris inside the open areas that eventually come out as the water flows through them. They have been dug up from a dead reef that became part of dry land and they do contain a lot of dust even though they have been washed prior to BRS getting them.
During shipping you will also get some dust and possibly some small parts breaking off (keep them for rubble or to fill in any open areas when you stack the rocks) if the rocks bang together during shipment. BRS packages their products well, but there is still the possibility of some breakage.