Thinking about adding Anthias?

i was looking at my anthias i believe i may have 2 males and one female. 2 look more alike. 2 have the yellow stripe down their side, where the ones is so faint you hardly see the strip its like its not there, that one is also the smallest of the three. all threes color is pretty bright. the smallest is the one that is most aggressive . she never causes any problem ( its a fast swim at other fish in the tank, bug them and swim off)