Your Phal has few roots but can make it if you stick to conventional culture methods. Please see
AOS Culture Sheets for culture information from American Orchid Society.
It sounds like you have moved the plant from pot to vase culture to a mount in quick succession. The frequent changes are potentially very stressful for a plant.
I will suggest one more move, then care for it, but leave it be, no more moves. Re-pot into a pot with good drainage holes, the smallest pot that will fit the roots. Pot with a bark-based potting medium. Water the medium (bark) only, not the leaves, until water floods through the pot, twice a week and no more (do at the sink; easier to do). Don't bother with fertilizers, supplements, etc. until you start seeing some root an leaf growth. Do this and your plant will recover.
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