Pleurothallis palliota leaves yellowing

[Tindomul]

I have this same species, in the exact same mount. I keep it inside an open aquarium that has only 4 inches of water in it that I use too keep my newt in. I mist it everyday, and water it twice a week, once weakly with fertilizer. It recieves about an hour of direct sunlight in the early morning and temperatures are no higher than 80, usually getting into the low 60's at night due to AC. Hope this helps you out.