Nice to see your T's! Your second rosie looks like he/she is doing a pokie stance lol.
May I make a suggestion for your rosies? When we got our first one, which was a rosie, we too put her on that same substrate. We then found out she hated it and she'd try to climb the walls and a rock in the tank. What is best for rosies/desert T's is a fairly dry substrate of eco-earth in a brick form. She was a lot happier once we switched her to that =)