I'm no fish expert, but last year in my class we had 2 fish tanks with Mollies in them. We started out with two at the begining of the year, and by the time school was over, we had over 20 fish We had to set up another tank to keep them all in. We had to separate the babies from the adults as soon as we could because the father will eat them.

Here's a little bit of facts from the top of my head (I tried searching for it, but didn't come up with any really good stuff, so this'll have to do ).
I think Mollies give live birth, unlike other fish.
The father fish will try to eat the babies, but the mother will try to protect them.

Ok that's it I know, it sucks, but I really don't know fish