Violent Behaviour?

[random919]

I have 3 mollies (1 black male, 1 silver female and one dalmation female) and the silver one is pregnant( i think about a week away now) and the other doesn't look it. I have had them for about 7/8 weeks and the dalmation still doesn't look pregnant and the male is continually chasing her and she is very distressed. he actually looks like he is hitting, nipping and barging into her. she is DEFINATLY female and he is DEFINATLY male. What should i do? she comes up to eat but gets chased away and she is always hiding under the bridge or the ship ornaments. its very distressing for us and her.
We have just added 2 dwarf gourami males and 4 Rummy Nose Tetras. Its a 70L tank and all of the levels are fine.
Thanks
random919

 

[KrystaK]

I had a similar situation with a group of my mollies. I had an orange sail fin male, two female dalmatians and an orange female. All of the other mollies were dominant to the smallest (And ironically oldest) female dalmatian molly. The male molly would outright chase her away from everything.
Why?
Sexual frustration, she wouldn't let him mate with her,(Which seems to be your problem if she still isn't preggo) The other females saw that she could be chased away so they learned to chase her away and bully her as well. And due to the fact that she's the smallest of the group, that just made the bullying worse. She would always hide in the back and had her fins clamped with stress.

The simplest solution is to get a second tank for her (Or re home her) My little female molly (Who I nicknamed Misfit) is now pretty happy in a 20 gal with my Betta Casper (I'm lucky Casper tolerates her, otherwise I don't know what I would have done) and some Corys. After a bit of fitting they've calmed down the tank is peaceful, and she is much happier with Casper than she ever was with any of her own kind.

Some fish are just unique that way. Mollies can be housed in a tank as small as a 10 gal (depending on the size of the molly and the power of the filter, and the number of other fish in the tank)

Note: Seeing as you would only have a 1:1 ratio of male to female if you removed the dalmatian female, it would be best to get a third female molly and put her in with the male and female, otherwise the male will chase your silver female to exhaustion)