agree could be mating behavior.. if the one with orange (female by the way) is the bigger one then that answers the agreesion. i had a big female and little guy she always pushed him around till he got bigger than her and bred.. the way i see it is girls like strong guys who will be able to protect them and their off spring

survival of the fittest.. how big are they at your best guess? and who knows if the bred youd probably get domino convicts or atleast its what ive heard from mixin the black with the white..