I haave a male Gt about 8 inches, no hump on head. Last week i bough a female and another male which are about 4 inches(knew this one was a male because it had a huge hump). So i put the new female and male in with the bigger male with no hump, and a day or so later, the newer male with the hump, the hump dissapeared. The bigger male that had no hump still has no hump though. From what i understand is the one with the hump is the more dominent one so why dident the other male gt get a big hump?