First let's talk water. My vandas get at least heavily misted once if not twice daily. They need water and lots of it. You say it has no medium so therefor no water storage. Next to the 50% shade, way too much. Vandas need as much light as they will tollerate without burning. During the summer mine receive direct sun for many hours. With ecception of the hottest part of the day when they are in dappled shade. You say it was moved from a greenhouse setting. What care was it getting there to keep it thriving?