I kept my terrarium startup rather simple when it came to the plants. I am fortunate to live in an area that has a lot of different types of moss and such. We don't allow the usage of pesticides in Cape Breton either which is a huge plus. Went wild harvesting seleticing moss junks that were healthy and vibrant. Then I made a visit to the local Walmart and bought a few small tropicals from their gardening section. The choices had to be relevant to heavy misting and high humidity / temps. Since then I add / subtract based off the colony's needs. The only thing I noticed with the mantellas that may be different than other dart related species is that they prefer ground coverage and leaf litter over bromelaids and height. They do climb the odd time or so but that seems to be if I allowed the temp to get too high (past 80) or the humidity exceeds 75.