from pics im sure they are both females.If one is loosing weight and you have noticed the other being nasty you really need to house apart.Not all beardied dragons get along with others reguardless of sex.May i ask what size viv they are kept in? and please dont be ofended but you said you brought them as one of each sex so one would assume you intened to breed.......i think you should do a lot more research on beardied dragons before embarking on breeding them.