I'm a newbie orchid grower and have checked this site for my problem, but am still confused. I've had my Vanda (2 of them) for about 4-5 months and they were doing well with daily 10 min soaks and fertilizer every other week. One of them all of a sudden has yellowing leaves and base. What am I doing wrong with this little seedling? Appreciate any help..I don't want to loose this guy.