Are leopard geckos picky

You can NOT house two males together because of them being territorial! They will fight and most likely kill each other. As for females, that depends, most are not as long as they are in a big enough cage, but they can be. You can house two females in at LEAST a 20 gallon long. Do NOT house a female and male together, the male will become territorial when shedding, and they will mate to much (killing the female).