I would recommend getting a larger cage now rather than later. A 40 breeder is as small as you can really go (36" x 18" footprint). It's not the size of the lizard that determines what cage to use, but whether you have enough space to get an appropriate temperature gradient. Uros need a wide temperature gradient, with enough space in each area to move around in. Even if you can't get a new glass tank, a very large rubbermaid bin works as an inexpensive temporary solution.

Your basking spot needs to be boosted a little higher (120-130F), but doing so and still keeping enough of a cool side is dangerously difficult to do in a 20 gallon. It's very easy to overheat it. Too cool overall temperatures mean a long, slow death for the uro. Too high mean a quick death, to paraphrase someone whose uro knowledge I respect a great deal.
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Torey
Eugene, Oregon, USA
1.1 Saharan Uros (Joe and Arthur)
3.0 Mali Uros (Spike, Turtle, and Tank)
1.1 Ornate Uros (Scuttlebutt and Shazzbot)
1.1 Collared Lizard (Ripcord and Rorschach)
2.0 Green Anoles (Bowser and Sprocket)
1.1 Chubby Housecats (Roscolux and Jenny)

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