Hi DragonGoby,
Sorry for the late answer, I have been away for a couple of days.
Anyways, it's been some years since I potted it and with this species I strayed away from my usual medium (live sphagnum), but if I remember correctly I used one part each of peat moss, quartz sand and perlite. The soil is topped with sphagnum moss. I grow mine in a terrarium with high humidity so the soil doesn't dry out to fast, because the medium is rather open with good drainage.
Regards,
Christer