Sword Tail

Swordtails are vibrant and hardy freshwater fish named for the distinctive “sword-like” extension on the lower tail fin of males. Available in a wide range of colors—red, green, black, pineapple, and more—they are active, eye-catching, and ideal for community aquariums. Females are larger and lack the sword extension. As livebearers, Swordtails are also known for their ease of breeding.

Swordtail (Xiphophorus hellerii) – Complete Care Guide Description Swordtails are vibrant and hardy freshwater fish named for the distinctive “sword-like” extension on the lower tail fin of males. Available in a wide range of colors—red, green, black, pineapple, and more—they are active, eye-catching, and ideal for community aquariums. Females are larger and lack the sword extension. As livebearers, Swordtails are also known for their ease of breeding. Water Parameters Swordtails prefer stable, slightly alkaline and harder water: Temperature: 22–28°C (72–82°F) pH: 7.0–8.2 Hardness: 10–25 dGH Tank Size: Minimum 75 liters (20 gallons) Water Flow: Moderate Water Changes: 20–30% weekly Care & Maintenance Swordtails are hardy and beginner-friendly: Provide a well-planted tank with open swimming space. Maintain stable water conditions and good filtration. Use a secure lid—they are active and can jump. Feed a varied diet: flakes, pellets, algae-based foods, and occasional frozen/live foods (brine shrimp, daphnia). Include plant matter in their diet for better digestion. Regular maintenance is important to keep them healthy. Behaviour & Temperament Generally peaceful but active. Males can be territorial toward each other. Social fish that do well in groups. Constant swimmers, mostly in mid to upper levels. Non-aggressive toward other species when properly managed. Compatibility Excellent for community aquariums. Compatible with other peaceful to moderately active fish. Avoid highly aggressive or fin-nipping species. Suitable Tank Mates Guppies Mollies Platies Tetras (peaceful species) Corydoras catfish Rasboras Tank Mates to Avoid Aggressive cichlids Fin-nipping fish (tiger barbs) Large predatory fish Very shy or slow-moving species Pro Tips Maintain a female-to-male ratio of 2–3:1 to reduce male aggression. Provide ample swimming space—they are very active. Use floating plants for fry if breeding occurs. Keep tank covered—they are known jumpers. Feed balanced diet with plant matter. Monitor male aggression—separate if necessary. Summary Swordtails are colorful, active, and easy-to-care-for fish that thrive in community aquariums. With proper tank setup, balanced diet, and compatible tank mates, they bring energy, movement, and vibrant color to any freshwater setup.