The next size that Petsmart has is 18x18x24. It's not all that much more expensive, but it just seemed huge. Especially since she/he is still small. But if I packed it with plenty of foliage and climbing goodies, would she/he still be okay as far as stress goes? I imagine finding the food wouldn't take too long. I'm starting to see an excited response when the red cap re-enters the cage...