HCA: Hermit Crab Association

I recently just got 3 new hermit crabs that were abandoned for atleast a week I got the whole tank and the decor inside it however upon further inspection I noticed small bugs crawling on the sand and on one of the hermies claw I've never had any problem with this so obviously I had no idea what to ...

basically i just need to know what kind of wood the T-rex bark log is and if it's safe for my hermit crabs