I bought two, very small Lithobates last winter. They've both grown nicely to about 2.5 inches. But I'm not seeing any color yet. I know that it's possible that I have females and won't see color. My question is, when does a male lithobates begin to get color? If I do have females, I'd like to get a male to go with them but I don't want to buy another lithobates if I have a male in hiding.