Hi - I have a very large Jade plant that is indicating that it is having trouble. I have attached some photos. The "rusty" stuff that is on the leaves rubs off. I don't think that I have overwatered, but the plant has had reduced light for the past 6-7 months although not substantially so. Last year entire branches fell off from time to time but I thought this to be a natural occurrence. The reason I think my Jade is sick is because I have an identical one in another part of my office which appears to be thriving - receives about the same amount of water but more light. I was planning on shifting my sick jade to a different window and reducing water for a while before I would do anything more drastic. Anyone who may have seen this before I welcome your comments. Thanks in advance.