I recommend reading this sticky from the beginning. There is mention of some basic info on Phalaenopsis and how to cultivate them in the first 10 or so pages.
If the links don't work, I'll repost the links.
Should you choose bark as a potting medium, a medium grade bark should work fine.
Medium grade CHC will work too.
If you have further questions, ask away.
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Philip
Last edited by King_of_orchid_growing:); 04-11-2012 at 09:47 AM..