Well right now I am keeping my ball python in my 20gallon tank, but he is going to move into a larger tank in a few weeks hopefully, so i have been thinking about getting something else to fill up his 20gallon when he moves out. I've been looking into Geckos, and read that Leos can be housed in a 10gallon tank, what about a 20gallon? Would it be too much space for the little guy, or I should get another type of gecko?