https://youtu.be/mC4earMBHIo
Check out the link above . It shows a terrariums build with charcoal in the substrate. He builds many types of terrariums , paludariums, vivariums, Aqua scapes, terrariums in an aquariums. I could watch this guy all day. Explains all the details .
I’m so busy... “I don’t know if I found a rope or lost a horse.”
... lots of helpful people here. 
