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Not very long. We originally started out with 4 mollies in a 5 gallon aquarium. About 3 months later we realized 4 had turned into 17! Now they are in a 35 gallon aquarium and theres more! We have now had many babies, and watched them grow. Takes them about 6 months to become 2 inches long.

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14y ago
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Q: How long does it take for baby mollies to grow full size?
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