I have a 5 year old male Greek tortoise and my younger brother wants to get a 6 month old Greek tortoise. Would it be okay to House them together in my tortoise’s 6’x 4’ enclosure? Or should I wait for it to get older and have him keep it in a separate enclosure? Or should I never put them together do to the fact that my tortoise hasn’t seen another tortoise since he was a hatchling?