Small is fine to start. He needs more places to hide. Fake plants work wonders. You're going to lose any humidity with a mesh top so cover it with foil and tape the edges down on the outside of the tank. Nothing sticky ever goes inside of the tank.
i'm on mobile, could you link the "How To" sticky on glass enclosure set-ups for OP? it might help them.
Last edited by tttaylorrr; 09-01-2017 at 12:26 AM.