Holy Terrarium, Batman!
This terrarium has everything.
A little bit of charcoal at the bottom, of course. A small amount of soil for the Cryptanthus to grow in. Big smooth rocks fitted out with bits of green moss and preserved reindeer moss too squeezed between the rocks. Wild Tillandsias, and some other stuff too. All fit in rather easily through the big gaping front hole in the hanging glass terrarium.
(That Robin, he was such a scamp.)