Why is my dendrobium wilting?

My dendrobium has a new plant growing out of it for a couple of months now. Its almost the same size as the older plants that were there when i had bought it. But lately i noticed the new plants leaves are yellowing and drying out. What is causing this and what can i do about it?
No I wait until the moss is completely dry before watering again.
2012 AON ORCHID DENDROBIUM SPECIOSUM CURVICAULE MISTY MOON LINE 50MM2" POT
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1 comment
are you watering it too much? Orchids should never sit in water. a good rule of thumb is that orchids would rather be on the drier side than wet. Also, be sure it is not in regular potting soil-it could be smothering. . .good luck