Flag Tail Guppies have a tail fin that is broad at the base and tapers to a point, resembling a flag. This unique tail shape adds a touch of elegance to their appearance.
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Flag Tail Guppies have a tail fin that is broad at the base and tapers to a point, resembling a flag. This unique tail shape adds a touch of elegance to their appearance.
The Flag Tail Guppy is easily recognized by its large, rectangular “flag-like” tail that flows behind it as it swims. The tail can feature solid colors, multi-color patterns, or intricate mosaic designs, depending on the strain. Males are generally smaller but more colorful than females, with extended fins and more vibrant patterns.
1-3 years
Omnivorous
The Flag Tail Guppy is a perfect choice for hobbyists who appreciate elegance in motion. Its tail shape adds a unique dynamic to the tank, and with proper care, it thrives and breeds easily. Whether in a community tank or a species-only setup, it is both an attractive display fish and an easy breeder for beginners and experienced keepers alike.
Beginner
10 gallons
6.8 – 7.8
Moderately hard to hard
22°C – 28°C (72°F – 82°F)
2.5 inches
Peaceful community fish such as small tetras, rasboras, mollies, platys, Corydoras catfish, Otocinclus, and ornamental snails
Poecilia reticulata
Poeciliidae
Native to South America, selectively bred worldwide for tail shape and color pattern
Peaceful, active, thrives in groups
A balanced diet is key to maintaining vibrant colors and healthy fin growth. Feed a staple of quality guppy-specific flake or micro-pellets daily. Supplement with live or frozen foods like brine shrimp, bloodworms, and mosquito larvae 2–3 times per week to enhance coloration. Include plant-based options such as spirulina flakes or blanched vegetables to aid digestion and prevent constipation. Small, frequent feedings (2–3 times daily) are best for active guppies.
Livebearer – females give birth to fully developed, free-swimming fry approximately every 4–6 weeks
Flag Tail Guppies are highly prolific breeders. Females typically give birth every 4–6 weeks, producing 20–60 fry depending on her size and condition. They are livebearers, meaning fry are born fully formed and able to swim and feed immediately. In community tanks, fry survival is low without plant cover, as adults and tank mates may eat them. Breeding tanks with dense live plants such as Java moss or floating plants help increase fry survival rates. Fry grow rapidly and reach sexual maturity in as little as 3 months.
Maintain stable, clean water conditions. Ideal pH is 6.8–7.8 with moderate to high hardness. Perform weekly 25–30% water changes to keep nitrate levels low and prevent disease. Avoid strong water currents, as guppies prefer slow to moderate flow. Provide plenty of plants and decorations for hiding and resting spots.
Susceptible to common aquarium diseases like ich, fin rot, and fungal infections if water quality is neglected. Their long tails can be damaged by fin-nipping tank mates, leading to secondary infections. Overfeeding and poor diet can cause swim bladder problems or obesity.
Peaceful
Flag Tail Guppies are peaceful, lively swimmers that spend much of their day exploring their surroundings and interacting with tank mates. Their large, flag-shaped tail acts as a visual focal point, often waved gracefully like a banner while swimming. Males are more active and colorful, frequently displaying to females with quick bursts of movement and flaring their fins. They are non-aggressive and do best in groups of six or more, where their social nature shines.
The Flag Tail Guppy (Poecilia reticulata) is a selectively bred guppy variety that stands out for its unique tail shape resembling a fluttering flag. Native to the warm, slow-moving waters of South America in its wild form, this guppy has been developed through generations of selective breeding to achieve its signature rectangular tail. Its peaceful temperament, active swimming behavior, and adaptability make it one of the most versatile aquarium fish. In breeding, females release fully formed fry that can quickly multiply under good conditions, making them ideal for breeders. A varied diet rich in both protein and plant matter enhances their natural colors and maintains fin health. Best kept in planted tanks with calm community fish, the Flag Tail Guppy offers both beauty and easy care, making it a favorite for aquascaping and display tanks.