Black mollies are tropical fish that are all black with short fins. Black mollies do not occur naturally, but have instead been bred for their desirable traits for aquariums. They have shorter life expectancies than their wild relatives.
Black mollies need at least 30 gallons of water with strong plant life such as Sagittaria, Anubias, Java Fern and Vallisneria. They can acclimate to varying salt levels, but a teaspoon of salt is recommended per gallon in freshwater. They require a good filtration system and a clean tank each week. The water temperature should be between 20 and 27.8 degrees Celsius.
Black mollies are omnivorous. They can be fed algae-based flake food and meaty foods such as freeze-dried bloodworms and brine shrimp.
Male black mollies have pointed anal fins and larger dorsal fins, and females have rounded anal fins and a pregnancy spot. They are livebearers, which means they retain the eggs inside their bodies and give birth to live fish. Males have a tendency to want to mate continuously, especially in a well-planted aquarium, so for the health of the pregnant female, they should be separated once a pregnancy has occurred. The fry, or the baby fish, should be separated from the others once born, because the grown mollies will see them as food. Also, the male and female fry should be separated from one another to prevent mating and subsequent sterile fry and birth deformities.
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