Hello, this is a Echniposis chamaecerus Peanut Cactus and I have noticed discoloration on one side. I don’t know what I can do here. I bought from an online retailer, Mountain Crescent, whom I do not recommend as all my other plants died in a month and they would not replace. I would like to keep this last one alive and it has lived about 8 months. Should I cut off the one that is turning orange to protect the other? Is there a spray to help with this? I follow the Planta notes and it does dry out so not sure what I am doing wrong.