A ten would be fin if you can set it up vertically so he has room to climb up higher into the tank.
If you can not set it up vertially, the ten will be fine but if you can get something taller where you can get some taller plants into the tank he would be happier. Tall plants like Snake Plant, Bromeliads, or similar (should be common in your area) would be great. You can even just set the plant in with its planting pot as long as you clean the plant and replace the soil with some pet type substrate as the plants soil. Eco Earth, organic potting soil with NO fertilizer, or crushed coco fiber would work great. I even put a small layer of stones at the bottom of the pot to add weight and allow for good drainage of the soil.

Check out some of the members photo lmums for some ideas on setting up something more natural.

Hope this helps

Oh, and the would will heal over time.