Most Mud species will do fine in a 20gal long. Some that come to mind are, 3-striped muds, mississippi muds, and like you mention the white lipped muds. All require shallow water around 4-6in and do well with a small land area. To build a land area I would use a piece of glass cut to fit in your aquarium. Then glue it in place with 100% silicone. For substrate on the land side I would line the bottom with pea gravel about 1in, then do a sand/soil mix. That way you can plant plants in there. Although, you may want to keep the plants in small pots so you can move them around easier and not worry about flooding the land side when watering. Do use the UVB bulb over the water and a basking light over part of the land area. Be sure theres a cooler spot so he can get out of the heat, many will roam around on land and burrow.
Good luck and feel free to ask more questions.
Chris
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0.1 Red Eared Slider, 1.0 Common Snapper, 1.0 Bearded Dragon and a 55gal Native Fish Tank with a 6in LM Bass, 3 Crawdads and a Pleco.
I use to have a collection of Leopard Geckos that I bred, but have sold them.

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