Swordtail Behavior

[jcmissionary]

I have a question about swordtail behavior as the subject would suggest.

I have 4 swordtails in my tank, 3 female and 1 male. One of the females is pregnant. I've been watching them over the past day or so, and it seems that the male is chasing the pregnant female quite a bit. The other 2 females hide in the plants, so it seems that the male doesn't have anyone else to chase.

He isn't nipping their fins or anything. He just chases them around. Is this something I should be concerned about? Or is this just perfectly natural behavior? Any help I could get would be great!

[Cearbhaill]

Perfectly natural. This is why we recommend several females to one male- spreads the interest around and none get bothered too much.
Course if she is dropping any fry he's probably there for the meal..

[Fisher Price]

Male swords are very dominant and aggressive and will not give the females or any other males a moment of peace. You should put in some kind of divider for the pregnant female so she can relax a little without being harrased all the time, at least until after the babies are born.