What animals can live in a 15 gallon tank?

Hi I have a 15 gallon 24x12x12 tank with a lid I was wondering what non aquatic pets can live in there? I'm experienced with reptiles as I have a 10 year old carpet python 3 bearded dragons a long necked turtle and a blue tongue but those are too big for the tank and I don't want a lizard or snake or... show more Hi I have a 15 gallon 24x12x12 tank with a lid I was wondering what non aquatic pets can live in there? I'm experienced with reptiles as I have a 10 year old carpet python 3 bearded dragons a long necked turtle and a blue tongue but those are too big for the tank and I don't want a lizard or snake or turtle... I live in Australia so I don't have these PAC man frogs, leopard geckos, anoles and what not... If you suggest a frog also say what type please thanks guys.... Ohh and also no newts or salamanders are available...
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