Black Hi-Fin Swordtail
The Black Hi-Fin Swordtail (Xiphophorus helleri) is a majestic and elegant livebearer known for its deep black coloration and impressive high dorsal fin. These stunning fish feature a velvety black body that creates a striking contrast in any aquarium, complemented by an elongated, sail-like dorsal fin that adds to their regal appearance. Peaceful, active, and easy to care for, Black Hi-Fin Swordtails add both sophistication and drama to any community aquarium. Their hardy nature and striking appearance make them perfect centerpiece fish for peaceful setups.
Care Sheet – Black Hi-Fin 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
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Feed a varied diet:
High-quality flakes or pellets
Frozen or live foods: brine shrimp, daphnia
Vegetable matter
Feed small amounts 1–2 times daily
Behavior & Compatibility
Excellent for peaceful community tanks
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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 light substrate to contrast black color
Gentle water flow to avoid damaging delicate fins
Moderate lighting to showcase black coloration
Clean, well-maintained water
Care Level
Easy
Very hardy and beginner-friendly
Lifespan
3–5 years with proper care
Special Notes
Deep velvety black coloration with impressive high dorsal fin
Males develop sword extension and elaborate dorsal fin
Creates dramatic contrast in planted aquariums
Majestic centerpiece fish for community tanks
