Seen some posts on here that mention shower curtains as liners a lot but a few posts that also say trash bags work too. I just put a trash bag liner underneath my redfoots substrate today but am nervous about leaving him home with the heat lamp on tomorrow. Is this a fire/toxin hazard? Has anyone's tort tried to eat the liner before? Mine hasn't been known to munch on a lot of things that aren't food, so I may just be a little paranoid.