They're terrestrials. I've only grown one (Sobralia callosa), and didn't have success.
But from what I've read in a thread here on the OB where I asked someone who lives in Ecuador what kind of "soil" they grow in, it appears they grow in humus and leaf litter on top of volcanic rocks.
So I assume you'd grow it in pumice with a little potting soil and a little leaf litter.
They grow in bright indirect light, in intermediate conditions.
Many Sobralias get very large btw.
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