Mollie Mate Aggression?

LadyDragon

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Aloha everyone,
Last month I started a new "colony" of Mollies:
1 male leopard sailfin balloon lyretail
1 female wild color lyretail
1 female black Baloon
1 female big(almost 4 inches long) white sailfin
3 indexed juvaniles

They are in a 30g long tank with 5 longfin Panda Corys, 5 Kuhli loaches, 2 blue female guppies and a couple Japanese trapdoor snails from my Koi pond. They have plenty plant cover and a couple floating water hyacinth that they seem very fond of eating and playing in.

The big white female sailfin is easily twice the size of everyone else... She had a gravid spot when I bought them, and dropped 10 fry on her 4th day in the tank (they were removed to a separate 10g tank to grow, and now all are happily almost guppy sized) anyway, a couple days ago the male began obsessing over the female black balloon, who I am sure is going to drop fry soon (hard to tell if she is gravid, but she had been in with him almost 4 weeks now, and he has been mating with her since day 1) he is constantly swimming right below her belly and rubbing against her vent area...
The thing that is confusing me is that he has began chasing the large white female AGRESSIVELY... He had mated and used to court her many times in the previous weeks... Now -for nearly a week- he only fixates on the black Balloon female, and leaves her belly only to eat and chase the white female aggressively, it doesn't look like the courtship dances he used to do, he just flattens his fins and charges at her, then chases her around the tank til he looses sight of her.

Is this kind of thing normal? Or should I separate him from the girls for a couple days to see if that helps with his strange new behavior? (as I am fairly certain the obsession with one female and aggression toward another female is abnormal for a male livebearer)
 
Mollies itoo have kept and they breed like rabbits males do tend to chase females around sometimes aggressivelt to mate. if this is a different female from his first partner then he may be observing her or getting to know her lol. :good:

Also if the females are pregnant remove the males
 
He isn't chasing her for mating!
He mates with the black balloon and green lyretail, when he chases those females... He displays and does body rubs, his "chase" with them is only about half the speed he uses when he chases the big white sailfin female.

When he goes at the big white one, he flattens all his fins and turbos at her and then bites her fins! It's a totally different behavior... He chases the big white female (who is twice his size) like he intends to kill her! Fortunately the aquarium is well planted and has many places to hide, and tha she is a lot faster swimmer than he is (because she has regular fins I think, and his are all elongated... Plus he has balloon belly)

The big white sailfin IS a female, and he used to mate with her before this week. He just randomly decided he hates her and has become completely fixated on the black balloon female. In fact half the time he only stops chasing the big white one, because he has crossed paths with his favorite little black balloon female, and must display for her, rub agains her and then mate her a couple times.

It just seems odd to me, and I worry for the big white female (who at 4 inches, is almost twice as big
As all the other mollies)
 

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