After a few years of growing the succulent, you will likely lose some leaves. Did this post help you figure out what's happening with your succulent leaves? It is crucial to wait for soil to dry before you water again. You should only water your Ariocarpus after it has completely dried out. Ariocarpus can only be grown in soil designed for cacti. These succulents need plenty of sun. They can be grown with little water. In these cases, a shadecloth or even moving the plants out of direct sunlight would be beneficial.