Here you can see the terrarium starting to take shape. The substrate is continually built up around the hardscape, with forethought as to where the plants will be placed. I chose to use coco husk chips mixed with activated charcoal, as this mixture allows good drainage, breaks down much more slowly than peat, and provides for good aeration of roots while retaining moisture well. For me it is the ideal substrate, allowing planting of epiphytes an bog plants alike in the same media.