I have a g.rosea sling that dug itself a little burrow about 2 days ago. He's in a deli cup, and the only thing I could find to use as a hide is a small black shot glass. He dug underneath the glass, then turned and pushed sustrate into the opening of the burrow. He dug up against the side of the cup, so I can see him, and he seems to be ok, but I'm worried he won't be able to dig back out. Should I try to move some of the substrate aside, or just leave him alone?