A 40 gallon tank is the minimum cage size. Of course, the biggest you can offer is the best. A 40 gallon works fine for my guy. I have two big pieces of driftwood going from one side to the other, some different types of fake cacti, fake Spanish moss, a buffalo skull, and a rock for basking. My guy loves the driftwood and rock. I would stay away from leafy greenery because mine thinks its a salad. Haha