I use exo terra enclosures for a lot of my animals and I tried modifying the backgrounds that come with them. I noticed how some people would get their T's, crickets, and other inverts on the other side due to a couple of pieces of styrofoam creating a gap between the glass. Taking the suggestions for many where they said to shave it off with a knife, the backing was very "crumbly." So with a lighter, I quickly wiped it over so the heat could smooth it out and make it completely flush to the glass. Now that I'm thinking about it, it was probably a bad idea to do so but I am unsure. There's no chemical smell or anything but I'm afraid that would it be possible that some chemicals or toxins leech into the substrate or the air of the enclosure making it unsafe for animals?