I cycled my tank with uncured rock. As stated above, it took longer (about 2.5 months), and I too did MANY water changes, but I was very happy with the results. Besides, who wants to dismantle a reef to get out those nasty little devil damselfish out when it's all done, and the shrimp just seems a little unnatural (maybe forced is a better word to use) to me. If you have patience, in my opinion uncured rock is the way to go. Good luck!