Hi all. Forgive me as I'm new here and having a hard time navigating this page. I have an adult N. Americanus who went under the substrate a few days ago, she hasn't come out. I'm assuming she's molting? She is moving around under there from place to place. But i thought they would become lighter, sluggish, more slow moving before a molt? I didn't notice any thing out of the norm before this happened. I need to change the substrate but I'm scared to disturb her? Should i just leave it? How long should it take? TIA