I have had this orchid for over a year. It came tightly potted in moss. It says to keep moist, which I do. It says light requirements are 500 - 1500, which my light meter confirms it is getting. It gets quite a lot of new growth, but it turns brown and falls off. Any suggestions on what to do would be greatly appreciated. I have several types of orchids that are doing great. This one has me stumped! Thanks!!!