Black Lyretail Molly

The Black Lyretail Molly (Poecilia sphenops) is an elegant and sophisticated livebearer known for its deep black coloration and distinctive lyre-shaped tail. These beautiful fish combine the velvety black color of the Black Molly with an elaborate tail that features extended rays creating a lyre-like appearance. Hardy, peaceful, and visually striking, Black Lyretail Mollies make excellent additions to community tanks and add both elegance and activity to any peaceful setup.

Care Sheet – Black Lyretail Molly (Poecilia sphenops)

Temperament

• Peaceful, active, and social

• Best kept in groups with mixed genders or single-sex groups

Adult Size

• 3–4 inches (males with longer tail extensions)

Minimum Tank Size

• 20 gallons for a small group

Water Parameters

• Temperature: 75–82°F

• pH: 7.5–8.2 (prefers slightly alkaline water)

• Hardness: Moderate to hard (10–20 dGH)

• Ammonia/Nitrite: 0 ppm

• Nitrate: <20–30 ppm

Diet

• Omnivorous (leans toward herbivorous)

• Feed a varied diet:

  • High-quality flakes or pellets

  • Spirulina-based foods for vegetable matter

  • Blanched vegetables and occasional protein

• Feed small amounts 1–2 times daily

Behavior & Compatibility

• Excellent for peaceful community tanks

• Compatible with:

  • Other livebearers, peaceful tetras, rasboras

  • Corydoras and other peaceful bottom dwellers

  • Peaceful gouramis and rainbowfish

• Avoid aggressive or fin-nipping species

Aquarium Setup

• Planted tanks with light substrate to contrast black color

• Open swimming space to accommodate tail flow

• Gentle water flow to avoid damaging delicate tails

• Clean, well-oxygenated water

Care Level

• Easy

• Very hardy and beginner-friendly

Lifespan

• 3–5 years with proper care

Special Notes

• Deep velvety black coloration with elegant lyre-shaped tail

• Males develop more elaborate tail extensions

• Creates beautiful contrast in planted aquariums

• Breed readily in home aquariums