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Buenos Aires Tetra (Hyphessobrycon Anisitsi)

Welcome to our comprehensive guide on the Buenos Aires Tetra, a popular freshwater fish known for its vibrant colors and dynamic presence in aquariums. This article is designed to provide aquarium enthusiasts and fish keepers with all the essential information about the Buenos Aires Tetra, ensuring a healthy and thriving environment for these beautiful fish.

Buenos Aires Tetra Facts

Fact Detail
Scientific Name Hyphessobrycon anisitsi
Common Name Buenos Aires Tetra
Native Habitat Rivers and streams of South America, particularly Argentina
Adult Size Up to 2.75 inches (7 cm)
Lifespan 3-5 years in captivity
Water Temperature 64°F to 82°F (18°C to 28°C)
pH Range 5.5 to 8.5
Diet Omnivorous – includes flake food, brine shrimp, daphnia, and bloodworms
Behavior Schooling; peaceful but can nip fins of slow-moving fish
Aquarium Size Minimum 30 gallons
Breeding Egg scatterer, does not care for young
Compatibility Best with similarly sized, active fish; avoid very small or long-finned species

Buenos Aires Tetra Profile

The Buenos Aires Tetra, scientifically known as Hyphessobrycon anisitsi or Psalidodon anisitsi, is a small, colorful fish native to the freshwater rivers of South America, particularly in Argentina. They are known for their hardiness and adaptability, making them a popular choice for both novice and experienced aquarists. Typically, these fish grow up to 2.75 inches in length and have a lifespan of about 3-5 years in captivity.

Buenos Aires Tetra Coloring

The Buenos Aires Tetra fish is admired for its striking appearance. These fish display a brilliant silver body with a hint of green or blue iridescence. The most distinctive feature is their bright red fins, which contrast beautifully against their shimmering bodies. During the breeding season, the colors of the males become more vibrant, making them even more attractive.

Buenos Aires Tetra Habitat

Buenos Tetra originate from the temperate to subtropical waters of South America, particularly in Argentina’s rivers and streams. They inhabit areas with dense vegetation and slow-moving waters. Their natural environment is characterized by a mix of clear and slightly murky water, with a variety of plants and a substrate of sand or fine gravel, offering both hiding spots and open swimming areas.

Buenos Aires Tetra Aquarium Setup

Creating the ideal environment for Buenos Aires Tetras is essential for their health and wellbeing. This section delves into the specifics of setting up an appropriate aquarium for these vibrant fish.

  • Tank Size and Water Capacity

Buenos Tetra fish require an aquarium that can hold at least 30 gallons of water to provide ample swimming space. Larger tanks are recommended if you plan to keep a school of these tetras, as they are active swimmers and enjoy exploring their environment.

  • Water Parameters

The water in the tank should be kept within a temperature range of 64°F to 82°F (18°C to 28°C), with a pH level ranging from 5.5 to 8.5. Consistent water quality is vital, and regular testing should be performed to ensure the parameters remain stable.

  • Filtration and Aeration

A high-quality filtration system is crucial to maintain clean and oxygen-rich water. Buenos Aires Tetras thrive in well-oxygenated water, so additional aeration through air stones or similar devices can be beneficial.

  • Substrate and Decor

The choice of substrate depends on your preference, but fine gravel or sand is ideal for these tetras. Decorations like rocks, driftwood, and live plants not only enhance the aesthetic appeal but also provide hiding places and reduce stress in fish.

  • Lighting

Standard aquarium lighting is sufficient for tetra buenos aires. If you have live plants in the tank, ensure the lighting supports plant growth while not being too bright, as it may cause stress to the fish.

  • Maintenance

Regular maintenance is key to a healthy aquarium. This includes periodic water changes (typically 25-30% every two weeks), cleaning the substrate, and checking the filter to ensure it’s functioning properly.

Buenos Aires Tetra Breeding

Breeding Buenos Aires Tetras can be an exciting challenge for aquarists. This section outlines the necessary conditions and steps to successfully breed these vibrant fish in captivity.

Breeding Environment

To encourage breeding, set up a separate breeding tank. This tank should be about 10-15 gallons, with a sponge filter for gentle water flow. The water temperature should be slightly higher than in the main tank, ideally around 77°F to 80°F (25°C to 27°C). Soften the water to a pH of around 6.0 to 7.0 and ensure it is well-oxygenated. Dim lighting and the presence of fine-leaved plants or spawning mops can help simulate the natural breeding environment of Buenos Aires fish.

Conditioning for Breeding

Before introducing them to the breeding tank, condition the breeding pair or group with high-quality, varied diets. Foods like live brine shrimp, daphnia, and bloodworms are excellent for conditioning, as they are rich in nutrients that stimulate the breeding process.

Spawning Process

Once in the breeding tank, Buenos Tetra typically spawn in the early morning. They are egg scatterers, meaning they will release their eggs randomly around the tank. The female can lay up to several hundred eggs during a single spawning. After spawning, it’s important to remove the adults from the breeding tank, as they might eat the eggs.

Egg and Fry Care

The eggs will hatch in about 24-36 hours, depending on the temperature. Initially, the fry are very small and require fine food like infusoria or commercially available liquid fry food. As they grow, they can be fed with newly hatched brine shrimp or finely crushed flake food. Regular water changes and careful monitoring of water quality are crucial during this stage.

Buenos Aires Tetra Diet & Feeding

A balanced diet is key to the health of Buenos Aires Tetras. They are omnivores and enjoy a varied diet of high-quality flake food, brine shrimp, daphnia, and bloodworms. It’s important to feed them small amounts several times a day to prevent overfeeding and maintain water quality.

Buenos Aires Fish Compatibility

Buenos Aires Tetras are generally peaceful but can be fin nippers, especially with slow-moving fish or those with long fins. They do best in a school of six or more, as this reduces aggression and stress. Ideal tank mates include other similarly sized and temperament tetras, barbs, danios, rainbowfish, mollies, and some catfish species. Avoid housing them with very small, timid fish or those with long, flowing fins like angelfish or guppies.

Buenos Aires Tetra Common Diseases

Buenos Aires Tetras are relatively hardy but can be susceptible to common freshwater fish diseases like Ich (White Spot Disease), fin rot, and fungal infections. Ich appears as small white spots on the body and fins, while fin rot causes the fins to fray. Good water quality and a balanced diet are crucial for prevention, and prompt treatment is necessary at the first signs of illness.


The Buenos Aires Tetra is a delightful addition to any freshwater aquarium. Their vibrant colors and active nature make them a joy to watch. With proper care, the right aquarium setup, a balanced diet, and suitable tank mates, tetra buenos aires will thrive and bring life and beauty to your aquatic world. Remember, the key to a healthy aquarium lies in regular maintenance and a deep understanding of the needs of your aquatic inhabitants.