I've had my russian tortoise a week, he hasn't eaten anything, as far as I am aware he hasn't pooped, etc and all he does is bury himself in his dark area and sleeps. He has a basking light and uv light, the temp says 30°c and his dark area is 20°c. I have the lights on for 14hours minimum. I've been taking him out of the dark area and putting him under the lights, he stays there for a bit but then walks back to the dark area and digs to sleep. I don't know what else to do, really worried for him. Anything else I can do?