Black Tetra (Gymnocorymbus ternetzi), commonly known as Black Skirt Tetra or Petticoat Tetra, is one of the most popular and hardy freshwater aquarium fish that has rightfully earned the love of aquarists worldwide. This elegant representative of the Characidae family remains a relevant choice for both beginner and experienced aquarists in 2026.
In my experience working with various tetra species, the Black Tetra stands out for its remarkable adaptability and peaceful nature. Over recent years, breeders have developed numerous color variations of this fish, including golden, albino, and even genetically modified fluorescent forms, significantly expanding possibilities for aquascaping.
Description and Appearance of Black Tetra
The Black Tetra has a characteristic diamond-shaped body, laterally compressed. In nature, the fish reaches 5-6 cm in length, while aquarium forms are usually slightly smaller at 4-5 cm. The basic coloration of the wild form is silvery-gray with three characteristic black vertical stripes running through the body. These stripes may fade with age.
The anal fin of the Black Tetra deserves special attention — it is fan-shaped and quite large, giving the fish particular grace when swimming. The dorsal fin is high and pointed. Sexual differences are not very pronounced: females are usually fuller, especially during breeding season, while males are slimmer and more brightly colored.
Black Tetra Care and Maintenance in Aquarium
Black Tetra is a schooling fish, and I strongly recommend keeping a group of at least 6 individuals. When kept alone, the fish becomes timid and may show aggression toward tank mates. For comfortable maintenance of a school, you’ll need an aquarium of at least 60 liters.
Water Parameters for Black Tetra
| Parameter | Value | Notes |
|---|---|---|
| Temperature | 22-26°C | Optimal 24-25°C |
| pH | 6.0-7.5 | Prefers slightly acidic water |
| Hardness (GH) | 5-15°dGH | Adapts well |
| Hardness (KH) | 4-8°dKH | Stability more important than exact values |
| Ammonia/Ammonium | 0 ppm | Toxic to fish |
| Nitrites | 0 ppm | Toxic to fish |
| Nitrates | <20 ppm | Weekly water changes |
According to PlanetCatfish data, Black Tetra shows high tolerance to water parameter changes, making it ideal for beginning aquarists.
Aquarium Setup
Black Tetra prefers aquariums with dense vegetation and subdued lighting. Fish enjoy hiding places among plants but also need open swimming space. Dark substrate enhances the beauty of their coloration.
Ideal plants include:
– Vallisneria
– Hornwort
– Java Moss
– Anubias
– Cryptocoryne
Black Tetra Compatibility with Other Fish
Black Tetra is a peaceful fish, excellent for community aquariums. It coexists perfectly with Danio choprae, Dwarf Gourami, Black Molly, other tetras, and peaceful catfish.
In my experience, it’s better to avoid pairing them with very slow fish with flowing fins — active Black Tetras may harass them. I also don’t recommend keeping them with large aggressive cichlids.
Feeding Black Tetra
Black Tetra is omnivorous and undemanding in feeding. In nature, fish feed on small insects, worms, and plant matter. In aquarium, they accept all types of food:
- Quality dry flakes and pellets
- Frozen foods (bloodworm, brine shrimp, daphnia)
- Live foods (when available)
- Vegetable supplements
Feed 2-3 times daily with small portions that fish can consume in 2-3 minutes. It’s important to provide varied nutrition to maintain bright coloration and health.
Breeding Black Tetra
Black Tetra breeds relatively easily in aquarium conditions. Sexual maturity occurs at 8-12 months of age. To stimulate spawning, I recommend:
- Raise temperature to 26-28°C
- Increase feeding with live foods
- Prepare breeding tank with soft water (pH 6.0-6.5)
- Use fine-leaved plants or synthetic spawning substrates
Females lay 300-1000 eggs, which males fertilize. Incubation lasts 18-24 hours at 26-28°C. Fry start swimming on day 3-5 and require finest food — infusoria, rotifers, then brine shrimp nauplii.
Health and Disease Prevention for Black Tetra
Black Tetra has robust health but can be subject to typical aquarium fish diseases. Most common are:
- Ichthyophthirius (white spot disease)
- Fin rot
- Bacterial infections
- Fungal diseases
Prevention includes maintaining water cleanliness, quarantining new fish, quality feeding, and avoiding stress. More details about fish disease diagnosis and treatment can be found in the appropriate section.
Modern Selective Forms of Black Tetra
By 2026, breeders have developed numerous color variations of Black Tetra:
- Golden Black Tetra — bright yellow-golden form
- Albino Black Tetra — white with red eyes
- Longfin Black Tetra — with elongated fins
- Colored forms — pink, blue, green (often using dyes)
- GloFish Black Tetra — genetically modified fluorescent forms
It’s important to note that some bright forms may be obtained through dyeing, which negatively affects fish health.
FAQ about Black Tetra Care
How many Black Tetras should be kept together?
Minimum 6 individuals, optimally 8-10. Black Tetra is a schooling fish that feels comfortable only in a group.
Can Black Tetra be kept in a small aquarium?
A school of Black Tetras requires an aquarium of at least 60 liters. In smaller volumes, fish will experience stress.
Why has my Black Tetra lost its bright coloration?
This is usually related to age, stress, unsuitable keeping conditions, or monotonous feeding. Improving conditions and varied feeding will help restore coloration.
Is Black Tetra aggressive?
Black Tetra is a peaceful fish but may show intraspecific aggression when kept in small groups or unsuitable conditions.
How long does Black Tetra live in aquarium?
Under good keeping conditions, Black Tetra lives 3-5 years, sometimes up to 6-7 years.
