I am a firm believer of offering as much space as possible for your animals. They may not utilize it all the time, but the option is there. My Anteresia is barely 3ft long and he is in a 36inx18inx16in and I feel that is too small, I would love to upgrade him and plan on it in the near future once all my other animals are upgraded, that being said I am also the guy that uses bio-active substrate, live plants, and tries to make the enclosures match as close to their natural habitat as possible....so my cages are constantly evolving.