Sword Koi

Koi Swordtail (Xiphophorus hellerii)

The Koi Swordtail is a vibrant and eye-catching freshwater fish known for its striking mix of orange, white, and black coloration—resembling traditional koi patterns. Males are especially unique, featuring a long, sword-like extension on their tail that gives this fish its name.

Hardy and easy to care for, Koi Swordtails are a great choice for beginners and make a lively addition to any community aquarium.

Water Parameters

• Temperature: 72–82°F (22–28°C)
  Ideal range: 74–78°F
• pH: 7.0 – 8.0
• Water Hardness: Moderate to hard
• Tank Size: Minimum 20 gallons
• Group Size: Best kept in groups (1 male to multiple females recommended)

Diet & Feeding

Koi Swordtails are omnivores and not picky eaters.

Staple Foods:

• High-quality flakes or pellets

Protein / Treats:

• Frozen bloodworms
• Frozen brine shrimp
• Daphnia

Vegetable Matter:

• Spirulina flakes
• Blanched vegetables (zucchini, spinach)

Feeding Tips:

• Feed 1–2 times daily
• Only what they can eat within 30–60 seconds
• Provide a varied diet for best color and health

Behavior & Tank Mates

• Peaceful and active swimmers
• Males may show mild aggression toward each other
• Very social and do well in community tanks

Compatible Tank Mates:

• Tetras
• Mollies
• Platies
• Corydoras
• Gouramis

Avoid:

• Very aggressive fish
• Fin-nippers

Tank Setup

• Open swimming space with some plants or décor
• Moderate water flow
• Well-lit tank enhances coloration

Key Benefits

• Bright koi-like coloration
• Hardy and beginner-friendly
• Active and engaging fish
• Great for community aquariums