Sliver Sailfin Molly

Sailfin Molly (Poecilia latipinna / Poecilia velifera)

The Sailfin Molly is one of the most celebrated and attractive livebearers in the aquarium hobby, known for its wide range of stunning colour forms. It is named for the large, impressive dorsal fin displayed by males, which makes this species a true standout. Decades of selective breeding have produced an almost endless range of colour varieties, including black, green, dalmatian, golden, harlequin (calico), chocolate, albino, creamsicle, and many more.

Although Sailfin Mollies originated in freshwater, brackish, and marine environments across southern North America, modern tank-bred specimens are almost exclusively raised in alkaline freshwater and thrive in these conditions. Reaching around 10–12 cm (4–5 inches) as adults, they are considered large for community fish. Despite their size, they are generally peaceful, active, and outgoing, making them an excellent addition to many mixed-species aquariums.

Behaviour & Compatibility

Sailfin Mollies are compatible with most peaceful aquarium species when kept in a suitably spacious tank. As omnivores, they may prey on very small dwarf shrimp or shrimp fry, but they are otherwise safe to keep with peaceful invertebrates. They mainly occupy the middle and upper regions of the aquarium.

This species is capable of jumping, particularly during the early stages of acclimation, so a secure lid is strongly recommended.

Feeding

Sailfin Mollies are not picky eaters and readily accept a variety of high-quality dry foods. These should be supplemented with frozen foods, especially those high in plant matter, to support digestion, overall health, and vibrant colouration.

Plants & Aquascaping

Live plants are not essential, but they are appreciated. Hardy stem plants, rooted plants, mosses, and Marimo Moss Balls are generally safe as long as the fish are well fed. Their adaptable nature makes them suitable for both planted and lightly decorated aquariums.

The Sailfin Molly is an excellent choice for both beginner and experienced aquarists.

What We Like About This Fish

• Hardy and adaptable

• Beautiful variety of colour forms

• Excellent for medium and larger planted aquariums

• Peaceful disposition

Recommended Tank Parameters

• Temperature: 22–26.7°C (72–80°F)

• pH: 7.0–8.5 (7.5 or higher is ideal)

• KH: 15–35 dKH

• Minimum tank size: 10 gallons for a single fish, 30+ gallons for a group

Care Guidelines

• Diet: High-quality flake foods and frozen foods, especially those high in plant matter

• Social behaviour: Shoaling; peaceful with most species

• Origin: Tank-bred; native to southern North America, including Mexico

• Average adult size: Males up to 12.7 cm (5 inches), females up to 10.2 cm (4 inches)

• Average purchase size: 2.5–7.5 cm (1–3 inches)