phalaenopsis bellina yellow leaves

[zxyqu]

Ok. Well if you have good quality water I'd try and water more frequently. I know this may scare some, but in my hands Bellina like it constantly warm and constantly moist. Plus bark can be annoying to get 'rewet' enough to hold water if it dries too much. In my space bark needs watering once every 2-4 days to stay moist, but it may be different in your conditions.