Received one of these as part of a "dish garden" (actually a basket with individually potted plants). It's adorable, and I'm not really sure how to take care of it. I've got it planted in a glass bowl right now, terrarium style, and it's not drying up & dying anymore. It's not covered, but is doing well (when it was covered, it was too humid, & a bit of mold started growing on it).

Any suggestions on keeping the little guy alive would be greatly appreciated! In particular, I'm curious how deep its soil should be. Right now it's about three inches or so, and a couple of the fronds are escaping the container. As long as the plant is mostly in the more humid terrarium, will the bits sticking out do okay, or do I need a bigger container?