I cycled dead live rock for 3 months with a little bit of live rock before using it in my main tank. At 6 weeks I added a few snails & they did fine. After the 3 months I transferred the rock to my main tank. The main tank cycled for another 6 weeks before I started adding any types of corals, crabs, or fish. At 6 months most of the rock is covered with coraline. Good luck.