Against my better judgement I just purchased the finicky easy to kill Crompton Carousel. I am zone 6 Western Pa and all my succulents are indoors, south facing windows ,some have grow lights. I lost a black knight a few months ago, it looked fine one day and next leaves all fell off. I have them in combination cactus soil and pumice , very well draining. I generally water every 10 days. Anything else I could do to keep my new guy alive?