Vanda Orchid Tree Problems?

Question:Hi, I bought a gorgeous 5 year old bloomed Vanda Orchid Tree and the leaves started to turn yellow 2 weeks ago. I'm really concerned as this is a stunning plant and don't know if it was overwatered or if the heat got to it.

I just want to point out that I stopped the misting, and am giving it another few days before I try again. I noticed that some of the root tips are black.

My other Vanda Orchid is fine... What is wrong?

Any helpful advice would be appreciated.

Answers:
It is too dry place some sphagnum moss around the roots and see if that helps, it is too dry I assume.