my potting media for my phals is 1 part coconut husk chips,1 part charcoal pieces, and 1 part clay pellets. I usually repot a newly bought phals that is in spagnum moss in the above media combination, since moss tends to retain too much moisture and rots the roots. While the above media drains pretty quickly and dries up a bit quicker than moss and there by minimises root rot.
personally i think a combination of both bark and clay pellets will do well. Maybe others, more experienced grower, will chime in for advice.
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