Thanks so much for the reply I have some medium, and fine bark. I might mix a little and pot it when it shows signs of growth
Orchid Wiz also said it can be re-potted any time there is new root growth. It sounds like not too fussy of a plant. It did mention that it won't bloom in temperate climates like Singapore, indicating it seems to need a slightly cooler and drier winter to initiate bloom. Hope that helps.