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How to take care of molly fry
Find a large enough tank.
Look for a tank between five and 20 gallons to raise your fry. If you intend to keep the mother molly in with the fry, have multiple broods going into the same tank, or if you have a large brood, opt for a larger tank.
Generally, for broods without their mother, a 10 gallon tank will be sufficient. If your fry are going to be live born, make sure you have the nursery tank ready before the mother gives birth.