02-08-2008, 05:48 PM
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Are you planning on separating the babies so that they all survive? You can leave them in the tank, and only a few will survive, or you can put them in a breeders net so that they cannot get eaten. If you plant the tank heavily more of the fry will survive. Also, breeders nets/traps can be stressful for the mother, and can cause the birth to go wrong. Breeders nets/traps also don't allow as much water circulation, so if the fry are growing up in there you'll have to clean it a lot more often. I'd recommend just letting the molly give birth normally in the tank, and putting in a bunch of plants, so that the fry can hide. It means your population won't grow too large, but some of the fry will survive.
Also, don't be worried if you don't see many/any fry from the first few pregnancies. Young fish can have very small pregnancies in the beginning, but you'll have bunches of them in no time!