Well, in the last month, our molly has given birth twice...with about 50 fry each time. The first time, the molly hid under the air stone decoration while giving birth. Of course, I moved out the adult fish to a bigger tank. All the fry are still alive (just moved 25 of them to the 55 gallon. They are about a half inch long). The same fish just gave birth again friday.
With the new batch, I noticed that they tend to stay out of the way of their older siblings, even though their brother and sisters are too small to eat them.
Do you have a lot of decoraction and such in the tank? They might be hiding. When I put the older ones in the 55 gallon, the first day or so they stayed out of sight of the rest of the fish. Survival instinct I would imagine.
Of course, the Angels could of eaten most of them
If there are any left, I would get a breeding net. I was gonna go that route but it would of been way too crowded for them. Hope this helps.
Oh, forgot to add that she was done giving birth with an couple of hours.