I've recently purchased one of these mounted with sphag, and out of the dozen plants from the seller this one has struggled the most. I've moved it from a bright hot humid greenhouse to a shadier warm humid one, and now a bright spot in a terrarium with paphs. It just keeps going downhill and yellowing leaves then losing them. Is there something specific I should be doing with this different to most other orchids? It has been quite warm in recent weeks.