We have a lot of animals and our Russian Tortoise, Artemis, is living in a 3x2 Zoo Med tortoise house right now. I want to get another to double the space, but I have no idea where I would put it. What is an appropriate size enclosure for him? Since we are in cold Ohio, he will only eat to go outside most days from maybe June-August in the outdoor habitat we are building him. Also, since his cage is so small, I don't know what 'toys' to give him to entertain him.