Red Koi Swordtail (Xiphophorus helleri) is a popular freshwater aquarium fish known for its striking coloration and hardy nature. 

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Appearance

• Bright red to orange body with white “koi-like” patches
• Males have the distinctive “sword” extension on the lower tail fin
• Females are larger but lack the sword

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Size

• Males: ~3–4 inches (excluding sword)
• Females: ~4–5 inches

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Care Requirements

• Tank size: Minimum 20 gallons
• Temperature: 22–28°C (72–82°F)
• pH: 7.0–8.0 (slightly alkaline preferred)
• Water hardness: Moderate to hard

They’re very hardy, making them great for beginners.

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Temperament

• Peaceful and active
• Males can be territorial with other males
• Best kept in groups with 1 male to 2–3 females

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Diet

• Omnivores:
  • High-quality flakes or pellets
  • Frozen/live foods (brine shrimp, bloodworms)
  • Vegetables (blanched spinach, zucchini)

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Breeding

• Livebearers (like guppies and platies)
• Very easy to breed
• Females can store sperm and produce multiple broods
• Fry should be separated or heavily planted tank used for survival

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Tank Setup Tips

• Moderate planting with open swimming space
• Add hardy plants (Java fern, Anubias)
• Gentle filtration with good oxygenation

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