vining/trailing micro mini recommendation?

[Zyzzyzus]

Hello,

I am making a terrarium for micro mini orchids. This is a 8" x 8" x 12" container. It doesn't have a fan but I am prepared to install one if it becomes necessary. At present standing water on the leaves evaporates within 30 minutes. Probably less time but I keep forgetting to check. Currently I have a Barbosella handroi and a Stelis repens. I am specifically looking for recommendations as to what to put in the cork tube over the Stelis, but any general recommendations would be appreciated too. Temps range from 68-70 in the day and 60-63 at night. In the summer, due to ambient heat, I expect temperatures to range from 70-78 F.

Thanks!