I had a question about my small terrarium. I'm late posting about this, but about a month ago I noticed what looked like black mold in the cork bark I had recently put in the terrarium for my isopods. Then after a couple weeks it seemed to have gone away. I didn't treat it with anything. And there are springtails. When making the terrarium I didn't add charcoal, but later on I added a little to the top of the substrate. What I think was black mold was a bluish, green color just in a few spots on the cork and I don't think anywhere else. I don't have pictures of it unfortunately. There's nylon covering the top of the terrarium. Now there's a white mold on some of the spaghnum moss and under the cork. Should I do some sort of cleaning to make sure the bluish green mold doesn't come back? I did bake it in the oven before I added it. I can also add more charcoal, just not sure if it works the same if it's put on top of the substrate? And is the white mold a problem? Thanks