Red Swordtail

The Red Swordtail (Xiphophorus helleri) is a classic and vibrant livebearer known for its intense solid red coloration and distinctive sword-like tail extension in males. These beautiful fish feature a deep red color that covers their entire body, creating a striking visual impact in any aquarium. Peaceful, active, and easy to care for, Red Swordtails add both intense color and constant activity to any community aquarium. Their hardy nature and beautiful appearance make them one of the most popular and enduring choices for both beginner and experienced aquarists.

Care Sheet – Red Swordtail (Xiphophorus helleri)

Temperament

• Peaceful, active, and social

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

Adult Size

• Males: 4–5 inches (including sword), Females: 5–6 inches

Minimum Tank Size

• 20 gallons for a small group

Water Parameters

• Temperature: 70–82°F

• pH: 7.0–8.0 (prefers slightly alkaline water)

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

• Ammonia/Nitrite: 0 ppm

• Nitrate: <20–30 ppm

Diet

• Omnivorous

• Feed a varied diet:

  • High-quality flakes or pellets

  • Frozen or live foods: brine shrimp, daphnia

  • Color-enhancing foods to maintain vibrant red

• Feed small amounts 1–2 times daily

Behavior & Compatibility

• Excellent for peaceful community tanks

• Compatible with:

  • Other livebearers, larger tetras, rasboras

  • Corydoras and other peaceful bottom dwellers

  • Peaceful gouramis and rainbowfish

• Avoid aggressive or fin-nipping species

Aquarium Setup

• Planted tanks with open swimming space

• Moderate lighting to showcase red color

• Moderate water flow

• Clean, well-maintained water

Care Level

• Easy

• Very hardy and beginner-friendly

Lifespan

• 3–5 years with proper care

Special Notes

• Intense solid red coloration covering entire body

• Males develop distinctive sword-like tail extension

• Breed readily in home aquariums

• Classic and popular addition to community tanks