so i have two mollies in a 20 gal, with other community fish. and the male (sail fin) is chasing the female (regular) and this has just started recently, what does this mean?
it means you have normal healthy mollies. the male is looking to mate. to help ease the stress on that female, try to get at least one more female. the stress from the male's adoration can sometimes take quite a toll. you might expect fry in the near future