A popular livebearer fish known for its solid black coloration and peaceful temperament. Hardy and adaptable to various water conditions.
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A popular livebearer fish known for its solid black coloration and peaceful temperament. Hardy and adaptable to various water conditions.
Solid black body with a sleek, elongated shape. Fins are fan-shaped and can be slightly transparent or fully black. Some variants may develop a golden or silvery sheen under strong lighting. Both males and females have similar coloration, but males tend to be slimmer with a gonopodium.
3-5 years
Omnivorous; eats algae, high-quality flakes, pellets, and live/frozen foods like brine shrimp or bloodworms.
Black Mollies are a hardy and attractive choice for both beginners and experienced aquarists. Their ease of care, peaceful nature, and fascinating livebearing breeding style make them a staple in freshwater fishkeeping. With clean water and proper diet, they thrive and provide endless enjoyment.
Beginner
20 gallons (for a small group)
7.0 to 8.5
10–30 dGH
72–82°F (22–28°C)
3 to 4.5 inches
Guppies, Platies, Swordtails, Corydoras, Tetras, Danios, peaceful barbs, snails, and shrimp (with caution).
Aggressive cichlids, fin-nipping barbs, and large predatory fish.
Poecilia sphenops
Poeciliidae
Central and South America – from Mexico to Colombia
Schooling and community-friendly; prefer groups of at least 4–6.
Feed 2–3 times daily. Provide a balanced diet with high-quality flakes or pellets, supplemented with vegetable matter (spirulina, blanched spinach, zucchini) and live/frozen foods.
Livebearer; females give birth to free-swimming fry, no parental care.
Mollies are prolific livebearers. A single female can give birth to 20–100 fry every 4–6 weeks. Provide dense plants or breeding boxes to protect fry from being eaten by adults. Fry can be fed powdered flakes, infusoria, or baby brine shrimp. Keeping more females than males reduces stress during breeding.
pH: 7.0–8.5, Temperature: 72–82°F, Hardness: 10–30 dGH, Ammonia/Nitrite: 0 ppm, Nitrate: <30 ppm
Ich, fin rot, fungal infections, and susceptibility to poor water quality. Mollies also benefit from slightly brackish water, which reduces disease risk.
Peaceful community fish; males may occasionally show territorial behavior.
Generally peaceful and social. They thrive in groups and do well in community aquariums. Males may occasionally chase females, so keeping more females than males helps balance aggression. They are active swimmers and constantly graze on algae and biofilm.
Black Mollies are one of the most common and beginner-friendly freshwater fish. Known for their solid jet-black bodies, they are hardy, adaptable, and thrive in both freshwater and brackish environments. They are active swimmers and can help with algae control in aquariums. Mollies are livebearers, giving birth to free-swimming fry, which makes them fascinating for aquarists interested in breeding. Their social and peaceful nature makes them excellent for community tanks, though males may display some mild aggression toward one another. With proper care, Black Mollies add elegance and movement to aquariums.