I would highly recommend watching YouTube videos on tolumnias by Roger Frampton (Roger's Orchids). I had never been successful in the past but after watching a few videos where he explains their culture and showed how to mount them, I understand my mistakes and have taken the plunge again a couple of months ago (with 4 nice ones from Tezula) and so far they're very happy. Biggest lessons I've learned from Roger: they're twig epiphytes so in nature they're out on the small branches of trees/shrubs and receive dew in the mornings and dry out by night; they thrive mounted with just a little sphagnum on the front of the mount; even if the roots appear brown they're still viable for the most part so I leave them; watch out for scale under the dried sheaths and in leaf crevices; don't cut the spikes until they're totally dried out because they can branch producing more blooms; and, yes, good air circulation.
Hope that helps - they're such a pleasure to grow.
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