Charcoal layer in terrarium
I'm about to put together a terrarium with activated charcoal, which I've never used in one before. All the instructions I've seen say to put moss (or something) between your charcoal and soil layers to keep them from mixing - I'm wondering, is strict layering purely aesthetic? Specifically, is there any reason I shouldn't deliberately mix the charcoal right into my soil, or is there a functional reason why it needs to be its own distinct layer? Thanks!