Hey guys!

So, a customer of mine came in today and asked if I wanted to buy a setup from him. It's an Exo-Terra cage, but I am not sure on the size. He said it's the smaller one (could be 12x12x12 or 12x12x18) and it's mine with everything for $20. Now, my issue is that I have no idea what to put in something this size. If there any type of frog (tree frog preferably) that stays small enough to live in that size of an enclosure for it's entire life?

Any suggestions would be helpful!

Thanks!!