I have an outside balcony on the north-facing gable end of my house and about 4 weeks ago I located a few orchid plants on the wall of the house under the roof overhang, so not in direct sunlight at any time. Initially, all seemed to be ok but in the last few days, the largest orchid a zygopetalum that was super healthy is looking pretty peaky. I am new to orchid care so do not know what to do for the best. I live in Del Cerro by Lake Murray in San Diego. I was told to not water the plants very often so have been dampening them once a week. I see that the roots on the Zygo are white/silver and I think they should be green. and white is a sign of insufficient water. Please help. I can send more photos..