Three Phalaenopsis in one large pot—two rebloom beautifully, one produces wilted flowers. You've sprayed both; the other is perfect. The problem likely lies inside the shared container.
Are they truly in one pot, or three smaller pots inside a decorative cache? If it's a single pot, the wilted plant's media may have broken down while the others are still okay.
After watering, smell the mix. A sour odor means the medium has decomposed and must be replaced. This is a common cause of isolated decline in grouped plants.
Repot each plant individually in fresh orchid mix. Southern California has many nurseries with supplies. If you need step-by-step instructions, just ask.
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