Thank you Karin!
Based on what you and Geopad2 said Im sure he is going to molt. He really closed himself up good under that piece of driftwood.
I threw in a cricket last night and it dashed in under the driftwood too. Im worried because I read that they can hurt a molting T

. I did see my T still moving under there yesterday so he is not molting yet. Are my worries justified?