I believe you are right on the exo terra's size so I guess we need to find a bigger one. Though for now he doesnt move around much. The terranium came with a humity and temp gauge each. Right now because it is hot in the house it says it is 80 degrees and 65 humidity. I am pretty sure that is the wrong amounts for him because he seems dry but they are with in the limits for what the instructions on the terranium said. I will find him a better dish.