Dendrobium keiki's and potting medium help needed

[Becca]

I have a few dendrobium keiki's from a mother plant that didn't make it. I was able to get the canes to put out a few keiki's and now the roots are a couple inches long but are growing horrizontally. I figure it's time to pot them up, but I'm wondering if I should use my normal dendrobium potting mix of Dendrobium Imperial Orchid Mix or if I should use a seedling mix for them, or if maybe moss would be best? I have three and I was thinking of potting them in a compot since they are still pretty small. Humidity is is high and temps are intermediate if that will help at all. Any recommendations on what I should do?