i think chams probably view a mirror image as another cham, so it stands to reason, that its likely to induce any # of territorial displays, but the cham is likely to view it as a stressful encounter, so i wouldnt have any mirrors in the cage area or make a habit out of showing her, her reflection. sure, there are exceptions, but as a general rule, most chams arent all that fond of other chams in their space.