Buenos Aires Tetra

Buenos Aires Tetra key facts

Care level

Beginner-friendly

Lifespan

5-7 years

Size

About 6cm (FishBase records 13.2cm TL)

Temperature

16〜28℃

Diet

Dried foods, frozen bloodworm, Daphnia, flakes with plant or algal content

Tank

Seriously Fish suggests a base of at least 90 by 30cm, about 81 litres at 30cm depth. It is not particular about decor, though it colours better in a structured, planted tank. Filtration need not be powerful, but it appreciates some water movement.

Water Temperature & Quality

Seriously Fish gives a very wide 16-28C, pH 5.5-8.5 and 1-20 dGH, but warns against holding it near the top of that temperature range for long periods. FishBase calls it subtropical and one of the hardiest tropical fishes for the home aquarium.

Tank Mates

It has a reputation for nipping fins, but this shows mainly when too few are bought or space is limited. Keep a proper group alongside active fish of similar size and avoid long-finned or slow-moving species. Rival males skirmish continually over females and position in the group, so provide sight breaks.

Diet & Feeding

In the wild it is taken to be a foraging omnivore, feeding mainly on worms, insects and zooplankton with smaller amounts of plant matter and organic detritus. It is easy to feed in the aquarium, but small live and frozen foods such as bloodworm plus flakes with plant or algal content keep it in better condition.

Breeding & Spawning

It is oviparous, and FishBase records that in captivity it spawns among plants with the eggs hatching usually in twenty to twenty-four hours. To spawn it, use a separate tank with fine-leaved plants and remove the adults once eggs appear.

Health & Notes

FishBase lists it as IUCN Least Concern, not on the CITES appendices and harmless to people. FishBase places it in Psalidodon and GBIF in Hyphessobrycon, so the name on a shop label may differ. It is hardy to a fault, which makes it easy to underestimate both its fin-nipping and the size it reaches.

About Buenos Aires Tetra

A hardy characin with a silvery body, yellow-tinted fins, and a black spot at the tail base. Tolerant of a wide 16-28°C range, the Buenos Aires Tetra is an easy pick for beginner aquarists.

7 things to know before welcoming a Buenos Aires Tetra

1. 1Wide Temperature Tolerance

   The Buenos Aires Tetra tolerates a very wide temperature range of 16-28°C, making it resilient to seasonal fluctuations and less vulnerable if a heater ever fails. This adaptability is one of the main reasons it's known as such a hardy tropical fish.

2. 2Keep It in a School

   When kept in very small numbers, this tetra is more likely to nip at other fish's fins. Keeping a proper-sized group not only curbs this behavior but also lets you enjoy its natural schooling movement.

3. 3An Active Swimmer

   This is an active fish that swims constantly with its school, so it appreciates a tank with plenty of open swimming space. A tank with more horizontal length lets you enjoy its energetic movement more fully.

4. 4An Easy Eater

   An easygoing omnivore, it readily accepts flake food, pellets, and frozen or live foods alike, so feeding refusal is rarely an issue. Build meals around a quality staple food and vary the menu occasionally for balanced nutrition.

5. 5Watch Long-Finned Tankmates

   Because of its fin-nipping tendency, take care when housing it with long-finned or slow-moving fish such as bettas or angelfish. Tankmates that are similarly active swimmers tend to make safer companions.

6. 6Tolerant of Water Changes

   Among aquarium fish, it's considered especially hardy and can tolerate minor fluctuations in water quality. That said, don't rely on its toughness alone — keep up with regular water changes and basic maintenance.

7. 7Prepare the Tank First

   Since it swims actively, set up your tank with some plants or decor for shelter while still leaving generous open swimming space. It's best to complete the tank cycling process before bringing your fish home.

Frequently asked questions about Buenos Aires Tetra

Q.What should I consider when keeping it with other fish?

A.Since it can nip at fins, it's best to avoid housing it with long-finned fish like bettas or angelfish. Choosing similarly active tankmates and keeping the tetras in a proper group helps spread out any nipping behavior.

Q.What water temperature does it need?

A.It tolerates a wide range of 16-28°C, so a typical tropical fish tank setup works well without issue. This adaptability makes temperature management easy even for beginners.

Q.Is this a good fish for beginners?

A.Yes, it's a hardy characin generally considered beginner-friendly. Its wide temperature tolerance also makes it easy to manage for those new to tropical fishkeeping.

Q.How large does it grow?

A.Adults typically reach around 6cm in length. An overseas fish database does note a record specimen of 13.2cm, but under typical aquarium conditions, around 6cm is a reasonable size to expect.

Q.How many should I keep together?

A.Keeping only one or a few tends to trigger fin-nipping toward other fish, so it's best to keep a reasonably sized group instead. Schooling together also lets you observe its natural behavior more fully.

Useful tools for Buenos Aires Tetra care

Learn more about Buenos Aires Tetra in the encyclopedia

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