Thank you! That's the water level that he was provided before. When I gave him deeper water yesterday he seemed very happy and put his head under the water and began moving it around.
I have one Russian tortoise that has not been properly cared for. He was in a glass cage with carpet instead of substrate he also has not had proper access to water. He has never been able to fully submerge himself in water, only partway. I am worried that if I provide a water dish for him to do...