Hi I am new to tortoise keeping. I have two delightful Hermann hatchlings, one came from a private home and the other from a pet shop. The one from the private home seems very contented and is eating very well. The other one seems to be unhappy in his surroundings. They are in a 3ft vivarium with repti turf as a substrate. They are kept at 30-31 degrees in the day and 20 at night regulated by a thermostat. They have a variety of mediums in the vivarium for exercise and interest and they are bathed daily and have quite a variety of food during the day. The second tortoise is constantly standing up on it's back legs trying - it seems - to scrape his way out - he has three times fallen over onto his back which is very scary! Why does he do this? What is he unhappy about? Also how long can a tortoise remain on its back before it dies? I don't know if I am being paranoid. They are both putting on weight. I have had the first one for 3 weeks and the second one for 2. I hope someone can help me please. Thanks.