In talking with people about medium, you most likely get a different answer every time on what works best for which plant. Everyone who grows orchids seems to have their own "special" mix they use.
The short answer is to try not to change the medium too much from what it was in before, assuming that the plant was healthy. The mottled leaf paphs like a little more light than the green leaf type. Because they like more light, they will have tendancy to dry out faster if grown under their ideal conditions.
I would try a 4 part mix of:
fine bark or coco husk
charcoal
sphagnum or peat chunks
perilite
this is a mix I use for paphs and its equal parts of each. You could go a little lighter on the charcoal and a little more of the sphagnum if you want.
To answer the terrestrial/epiphytic question, they are considered terrestrial by most because if they do grow epiphytically, they stay very close to the ground.
Good luck,
Justin
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