Your Molly
Hello rich...
Mollies are the most sensitive of the livebearing fish. They are extremely particular about their water and their food. Like all livebearing females, they will hold off dropping their young until water conditions are perfect for fry survival. You must prepare the tank properly or you won't have any young in the tank.
Large, weekly water changes of 50 percent is needed. Make the replacement water a bit warmer than what's already in the tank. 80 degrees is about right. You should have a trace of aquarium salt in the tank water. A teaspoon or a bit more in every 5 gallons of new, treated tap water is sufficient.
Livebearing fish thrive in large groups, but come time to drop their fry they must have privacy. Floating plants are important. Pennywort, Anacharis and Hornwort are good. You just drop individual stems of any of these into the tank. The plants provide hiding places for the female and the fry.
Good food and a variety will keep the fish healthy. Frozen, freeze dried and a little flaked. Feed often, when the fry show up, if the adult fish are well fed, they won't bother the fry.
Just some suggestions.
B