05-08-2012, 08:58 AM
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You'll want to upgrade your tank, or return the fish if you are in the 14 day window, a 10 gallon is too small for even a single full grown Molly.
You can read up on the profile for the Common Molly by clicking the shaded name. Females in particular get quite large, upwards of 5 to 6 inches in length.
As mentioned, if males and females are present, you will have a constant stream of fry, the females will give birth repeatedly every 4-6 weeks or so. They are live bearers, so there will be no eggs in the tank. If nothing is done to save the fry, they'll likely get eaten by the others, but since there are so many at least one is bound to survive eventually and you'll end up with more and more fish. They breed like mice ;) All live bearers are like this.