07-30-2010, 09:17 AM
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I have experience with guppies, mollies, swordtails and platies. Mollies are usually a lot better at not eating fry than the other ones. That said, make sure everyone is getting enough food and that you have shelter available for the fry if they need to hide. As mentioned by others, if it fits in the adults' mouth, they have a good chance of being eaten.
They will also grow faster if they are not in a breeding trap. If your friend's tank is ready, they could go now. Just make sure the temp and other parameters are similar to yours.
good luck :)