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To answer your question: Phaius tankervilleae is a terrestrial so it does better in a terrestrial mix which is more like a soil compound rather than large chunks of mix. As for growing conditions, they like to be moist but not soggy and although they do well in various lighting, mine seems to do best in shade.
Do you have any other orchids? We'd love to hear more about them
If you have any questions, feel free to ask.