Hey there! I'm an aquarium newbie with swordtails. A friend gave us 6 adults--2 male and 4 females plus 6 babies. We are keeping them in a 10gal tank. They arrived 3 days ago. I'm noticing that the 2 males are following, nudging, generally just pestering one of the smaller adult females. They just don't let up on her. Is this aggression or mating behavior? They seem to let the other females alone. Now it seems like the other females won't let her near them. This poor female doesn't seem to have a friend in the tank. Any ideas on what's going on here? I'm afraid she's going to get stressed from the constant harassment.