I grow several Drymonias, not D. folsomii though.

D.chiribogana is truly cast iron - and you do it disservice by keeping it in a terrarium.

Probably 50% humidity is just right but it will live with less or more. Will grow to a spectacular huge vining shrub, will bloom on old wood, leaves are quite fleshy and large. Light wise - about the same as AV.

Thanks for the info Irina, I'll take the D. chiribogana out of the high humidity. It's really there because that's how I started the seedlings and I haven't known what to change. They have suddenly started to get a lot bigger. It's too bad it's not from slightly higher elevation, otherwise I would attempt it outside (which is frost free, but cool in the winter). It sounds like a really nice plant.

The problem with growing outside is that Gesneriads attract enormous amount of pests. Bringing them back will require a diligent spraying before reuniting them with rest of your collection.