Meanwhile, the males will be smaller, and have a gonopodium, which is a modified anal fin that serves the purpose of hooking onto the female and depositing sperm. After you introduce the fish to … Once the female is fertilized, she will keep the eggs inside her body for 60 to 70 days until they hatch. Black Mollies are relatively small in size, with the males growing to a maximum of 3 inches, and the females often growing a couple of inches larger. To breed molly fish, start by setting up a 15-30 gallon tank for them that includes decorations, a substrate, and freshwater plants. Have you had the fish very long? Baby molly fish eat baby brine shrimp, vinegar eels, micro worms, baby fish food, high quality flake foods crushed into a powder, etc. If you want to save and rear them, you can get a breeder box and a new tank. The males will fertilize any females they come in contact with, and they will even try to fertilize females that have already been fertilized. Black Mollies tend to have between 20 and 30 babies, or fry, but not all of them will survive because the mother tends to eat her young. I have had lots of fry over the last 5 months. the Guppy, etc. I have atleast one pregnant female. One sure way to stop them is to remove the males or females and only keep one sex in your tank. Do you have females in … It all depends on what you want to do with them. Response: Assuming that you have pairs, they will give birth every 30 days if the tank conditions are right. Black mollies are easy to sex, and the females will be larger than the males and have a triangular anal fin. I have dalmation, black, cremecicle, silver, and gold dust. Baby mollies have a short digestive cycle, which means they should be fed often (3-5 times a day) in small portions throughout the day. Their lifespan will completely depend on how well they are cared for, but in the perfect scenario, Black Molly fish can live up to 5 years in captivity. From what I've read they can give birth monthly. Perfect Tank Conditions For Black Molly Fish Black mollies do not pair off when they mate. i have a 38G with momma and dads, a 10G for the smallest fry and a 30G for the ones im gonna trade at the lfs. Aim for variety and a balanced diet. I had no idea how quickly they would reproduce. ), may remain fertile for about 3 months after getting pregnant and separating them from the males. She will have 60 babies every 2.5 months and their average life span is 5 years so she will have 1,440 fries in total and as soon as she has her fries remove her away because she will eat them and you can feed the fries crushed flake food and feeding the … Then, purchase male and female molly fish so you have no more than 2 fish per 10 gallons of tank space. They usually give birth to between 10 and 60 baby fish, and the baby fish are usually about 1/2 inch long at birth. A male black mollies gonopodium. 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