You will always get quite a number of differing opinions when you ask about potting media. Thing is, none of them are wrong. Or right. For instance, I also use moss. Moss may well kill other people's oncids quickly. It depends on your conditions to some extent, but mostly your watering habits. I have pretty low humidity for most of the year and try as I might, can't manage to keep an optimal level for any length of time being that I grow indoors under lights. If my oncids were in bark they would dry up so quickly that I would have quit my job to keep up with watering needs.
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