My dendrobium s are happily growing in standard orchid mix...the same one I use for Cattleyas. I repotted them this summer, based on Bruce's advice that they should 1) be in smaller pots, and 2) that from the photo I posted the old media looked "broken down" i.e, no longer in firm discernible chunks. When it breaks down, the chunks get sorta crumbly and as they break down into smaller particles, they keep air from getting to the roots.
You may find the link in this previous post helpful:






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