Yeah, but usually they don't move it around while they're doing it. I vote that the T is just enjoying itself, my G. aureostriata loves to play bulldozer more than anything in the world. OP, I bet eventually you'll look into the enclosure and see some random hills, or burrows, or who knows what else. They're good little landscapers.either that or if the substrate is wet then it could just be getting a drink. T's can suck moisture from dirt.