This can cause an iron deficiency in your Crassula Moonglow succulent. In order to ensure healthy roots and normal growth, the Crassula Moonglow needs soil that is well-aerated. The CrassulaMoonglow is a hybrid of two cactus types that are used in very hot environments. Therefore, it likes heat. I recommend using equal parts perlite and the cactus blend if you live near a humid area. You'll also want to wipe or dunk the roots with an anti-fungal solution before repotting as well. The plant can be poisonous to both cats and humans.