Air movement is important. As for potting medium - use what your watering regime allows. If you water often - avoid sphagnum as it will stay too wet and rot your orchids roots. Here is a video I did on repotting a phal. I also link to a page here on the site that lists the materials used in the video.
How to Repot a Phalaenopsis Orchid
Cheers,
BD![]()








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