bugs

HELP!!!!I found millions of these tiny bugs (that are so small they look like specks of dirt in photos but I swear they crawl) all over my Leos enclosure today while changing the substrate and I have no clue what they are or how to get rid of them. I have currently got all his hides, rocks...

I'm currently designing a bio active tank/enclosure for my leopard gecko. I'm mainly concerned on possible toxins. If I place a turtle shell that has been taxidermied and probably off of amazon; will my leopard gecko be poised, will anything like dubia roaches, or isopods eat at it? If so is...