They said it would never happen. Some even said it couldn't be done. But I've done it: I cleaned and replanted Nina's terrarium.
Gone is the Pellionia pulchra. It grew well, it handled drought like a champ, but it choked out everything else, and eventually started choking out itself, even. So behold the next crew:
1: Murraya paniculata (seedling)
2, 4, 6, and 7: Begonia 'Tiger Kitten' cutting (4) and rooted leaves (2, 6, 7)
3: Ctenanthe burle-marxii
5: Episcia 'Coco'
The Ctenanthe has lived with Nina before, and did awesomely; I'm less sure about the other plants. They should all be fine in a terrarium, but I don't know if they'll be fine with the transplanting (which was kind of rough on the Begonias in particular) or the inevitable cricket-nibbling. There's also some danger that the Episcia and Ctenanthe may grow fast enough to crowd out the other plants. It's not even a particularly hypothetical danger, since that's basically what the Ctenanthe did the last time it was in the terrarium.
But we'll worry about all that other stuff later: right now all I care about is that I actually got it cleaned up, after many months of procrastinating, and consequently should be able to enjoy several guilt-free months before I have to do it again. It's surprising how much of a load off my mind that is.