Dendrobium kingianum question

[Irisha99]

Hi, all.
This is my dendrobium kingianum that had no roots. It finally produced two new canes with new roots(woohoo!). When is it safe to pot it up? Currently, I have it in a plastic container with a layer of hydroton and sphagnum moss. I keep about a centimeter of water on the bottom of the container so it’s humid but water isn’t touching the plant itself.
Thanks!