This can result in iron deficiency of your Crassula Moonglow. The Crassula Moonglow requires well-aerated soil to support healthy roots and normal growth. Because the Crassula is a cross between two cactus varieties, it also loves heat. I recommend using equal parts perlite and the cactus blend if you live near a humid area. It is also a good idea to soak the roots in an antifungal solution before you put them back. This plant is extremely poisonous for cats and humans, so it should be kept out of reach. These soil types might not be specifically made for cacti plants.