It's not recommended that you mix species. There could be a problem with fighting, but the main reason is due to sickness. Different species harbor different bacteria from which they are immune. However, other species may not be immune to them, and the constant exposure to high levels of it in a cage can cause sickness or death.

That being said, there are people who try it and are successful. If I were going to try it, I'd at least pick species that lived in the same areas naturally.
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0.10.0 Ball Pythons
0.1.1 Leopard Geckos
0.0.1 Egyptian Tortoise
0.0.1 Bearded Dragons

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