Black Molly – Poecilia sphenops
The Black Molly (Poecilia sphenops) is a classic freshwater livebearer known for its sleek solid black coloration, active personality, and hardy nature. Peaceful and easy to care for, Black Mollies are a popular choice for beginner aquarists and larger community aquariums.
Their deep black color stands out beautifully against green aquarium plants, light-colored substrate, and colorful tankmates. Black Mollies are active swimmers that do best in stable, well-maintained aquariums with good filtration and plenty of open swimming space.
Key Features
- Sleek solid black coloration
- Peaceful and active freshwater livebearer
- Hardy and beginner-friendly
- Great for larger community aquariums
- Can thrive in freshwater and may tolerate lightly brackish setups
Care Information
- Scientific Name: Poecilia sphenops
- Common Name: Black Molly
- Care Level: Easy
- Temperament: Peaceful and active
- Adult Size: Approximately 3–4 inches
- Minimum Tank Size: 20+ gallons recommended
- Temperature: 72–82°F
- pH: 7.0–8.5
- Water Hardness: Medium to hard water preferred
- Diet: Omnivore; offer quality flakes, pellets, algae-based foods, spirulina, blanched vegetables, and occasional frozen or live foods
Tank Setup
Black Mollies do best in aquariums with stable water parameters, good filtration, and open swimming areas. A planted aquarium with areas of cover and room to swim is ideal.
Mollies prefer harder, more alkaline water and can thrive in freshwater aquariums. They may also tolerate lightly brackish conditions when properly acclimated. Regular water changes are important because mollies are active fish and can produce a moderate amount of waste.
Diet & Feeding
Black Mollies are omnivores and benefit from a varied diet. Feed quality flakes or pellets along with algae-based foods, spirulina, algae wafers, blanched vegetables, and occasional frozen or live foods such as brine shrimp, daphnia, or bloodworms.
Best Tankmates
Black Mollies are peaceful community fish and do well with other livebearers such as guppies, platies, and swordtails. They can also be kept with peaceful tetras, rasboras, Corydoras, and other calm community fish that enjoy similar water conditions.
Avoid aggressive fish, fin-nippers, or species that prefer very soft, acidic water.
Breeding Information
Like all mollies, Black Mollies are livebearers. Females give birth to free-swimming fry instead of laying eggs and may breed readily in a healthy aquarium.
For best results, keep more females than males to reduce chasing and stress. Dense plants, floating plants, or breeding boxes can help protect fry if you want to raise them.
Frequently Asked Questions
Are Black Mollies good for beginners?
Yes. Black Mollies are hardy and beginner-friendly when kept in stable water conditions with good filtration and regular maintenance.
Do Black Mollies need brackish water?
No. They can thrive in freshwater, but they may tolerate lightly brackish water when properly acclimated.
Are Black Mollies livebearers?
Yes. Black Mollies give birth to live young and may breed readily in aquariums.
What is the best tank setup for Black Mollies?
A planted aquarium with open swimming space, good filtration, stable temperature, and harder alkaline water is ideal.
Can Black Mollies live with guppies and platies?
Yes. Black Mollies usually do well with guppies, platies, swordtails, and other peaceful livebearers.
Available at Tropical Treasures Wyo
Black Mollies are a great choice for aquarists looking for a hardy, peaceful, and active livebearer for a freshwater community aquarium. Visit Tropical Treasures Wyo in Cheyenne, Wyoming, or shop online for freshwater fish, live plants, and aquarium supplies.
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