Mollies and other livebearing fish produce live young (and quite big at that) so you don't have to worry about eggs or hungry parents. Only isolate the pregnet mother from the main tank if there are any fish in the tank other than mollies. Even platies and swordtails will have a go at new born mollies.
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If you have a big enough tank with enough hiding places, pH of around 7, you can keep virtually any fish together as long as all the fish are around the same size and these two groups of fish are avioded:
Serrasalmus
Tetradon(figure eights and dwarfs are the
exception).
I keep a successful community of fish in a 4 foot tank including the following families:
Cichlids, tetras, loaches, gouramis, barbs, rainbows, livebearers, killiefish, catfish, puffers.
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