I do not think the white on the leaves is salt from fertilizer. The color change is probably that they are drying out. When you move a plant from sphagnum, which holds a lot of water, to bark mixes, which drain quickly and provide lots of air, you have to water the new media much more than you watered the sphagnum to keep the roots hydrated.
I would water every few days for at least the first couple of weeks after repotting. The bark will eventually begin to hold water better and then you can water less often. Your Phal will also likely start putting out new roots soon which will adjust to the conditions of the new media.
I also personally always let water drain fully through the pot for several seconds to water. Most plants (beyond orchids!) prefer to be watered thoroughly and allowed to dry rather than getting watered in small doses more often.
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Hybrid Mode
