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Fish/Molly fish that gave birth


We have a black Molly, she gave birth a day after we bought her and we captured 21 babies and all have survived. Now they are still in the netted tank for babies in our regular 30 gallon tank.  Last night she gave birth again to 23 babies and 1 did not make it. We put the new babies with the 3 week old babies and there making it. My question is, I have a clown knife fish that's about 5 inches in total length do you think if I put the three wee old babies which are 1 inch in length, will he eat them???? And how cam she have babies so fast, and can they mate with any type of fish... I have no other mollies in this tank?  My email is

Thanks, Shannon

The fry can be placed with any other fish as long as they are too big to fit in the mouth of the other fish. If in doubt, don't put them with the other fish. Female Mollies, along with all other livebearers, can hold on to sperm for six months and sometimes longer. She can continue to have babies until she has used up the sperm. That is why you have had fry again. It can and most likely will, happened again.


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Jaymie Johnson


I have 30+ years experience in freshwater aquariums, including the 23 years I was in the Marine Corps. I am very knowledgeable in fresh water aquariums and can answer any question regarding them. Currently I am breeding Betta's and can answer any question that pertains to them. I am very knowledgeable in the cycling of an aquarium from start to finish. I know all about filters, and currently make my own. If I do not know the answer to your question, I will research it and give you the information that I find. I am also knowledgeable in freshwater diseases and can tell you what needs to be done to treat them.FYI......I am male not female. Don't let the name fool ya. lol


I have had aquariums all my life and have had many different types of fish.

The only education I have is from both raising the fish and reading everything I can find about them.

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