A small monitor that may fare well in your enclosure would be Varanus acanthurus - commonly know as the "ackie." They are very rewarding captives and inexpensive when compared to other Australian dwarf monitors. You would have to provide a minimum of one foot of substrate for the lizards, as they are burrowers. Most keepers recommend eighteen inches or even two feet of burrowing material.
I'm not the best source of information for these lizards, but I recommend the Monitor Forum and also www.varanus.net as reliable places for acquiring knowledge of these lizards. If you check out varanus.net, I wouldn't recommend asking basic questions, research first, and if you still have specific questions, then ask.

Other species that would be suitably housed in an enclosure that size: Crotaphytus sp., some Uromastyx sp., Tiliqua sp., etc.

Good luck!
-----
Roy Blodgett
Green Man Herpetoculture
royreptile@yahoo.com

1.1 Drymarchon corais
2.2 Pseustes sulphureus
1.1 Pseustes poecilonotus poecilonotus
1.1 Lystrophis pulcher
1.1 Boiga dendrophila dendrophila
1.2 Crotaphytus collaris
1.3 Crotaphytus bicinctores
2.3 Pogona vitticeps (snow and red/gold)
1.0 Iguana iguana

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