My 2 1/2 year old leopard tortoise will only eat green leaf lettuce. I have pulled it all out of his habitat and given him acceptable foods, but he still has not eaten anything for almost 3 days. Even mixing small amounts of lettuce up with it, he will not eat. How long before he gets hungry enough? Any experiences or alternative food sources? I need to get him on a new diet. Dont have the ability (space) to grow all of his food. Any ideas?