I use r/o water always have, on all my orchids. I use msu to fertilize every other week. I flush with rain water or r/o water once a month. The Paphs are very happy and the other Phrags it just seems to be this one. The spots seem dry, nothing is mushy or smelly, (now I am smellling my plants,
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Pics of the roots, look ok. Some new growth.
I am puzzled.