I keep my Black Mollies in 20 gallon tank on my desk so i can see fry. I remove them to a baby net or large mason jars till they are almost 1/2" and feed them to my Loaches and Pictus Cats. They usually breed breed fast enough i give a jar to a friend every now and then to feed to his Cichlids. Keep the water changed out well, I've noticed the cleaner the water it is the more likely to get a new batch (healthy fish healthy babies). Give them algae wafers everyday, mollies love algae - and from what I've read it will help them to bear more and healthier fry.
I've got too many males at the moment so breeding has slowed down. Anyone want a few male Black Mollies?