What size tank does a Buenos Aires Tetra need?

Buenos Aires Tetra needs a minimum of 20 gallons, with 30 gallons recommended. They are middle swimmers. Keep in groups of 6+.

Is Buenos Aires Tetra good for beginners?

Buenos Aires Tetra is rated "beginner" difficulty (1/5). Great for beginners.

What fish are compatible with Buenos Aires Tetra?

Buenos Aires Tetra is semi-aggressive but may nip fins. Compatible tank mates include other semi-aggressive fish with similar water parameters (pH 6-8, temp 64-82°F).

Buenos Aires Tetra

Hyphessobrycon anisitsi

Family: Characidae • Origin: South America

Buenos Aires Tetras are incredibly hardy, tolerating temperatures from 64-82°F. But they eat live plants and can nip fins.

Min Tank

20 gal

Max Size

Temperature

64-82°F

6-8

Lifespan

6 years

School Size

Swim Level

middle

Hardness

5-25 dGH

semi-aggressivebeginneromnivoreschoolingfin-nipper ⚠️

Is Buenos Aires Tetra Right for Your Tank?

Buenos Aires Tetra is an excellent choice for beginners — rated "beginner" difficulty (1/5). They're hardy, forgiving of minor water parameter fluctuations, and generally easy to feed. A 20-gallon tank minimum is standard — most community setups will accommodate them.

Buenos Aires Tetra is semi-aggressive — they can live with others but may bully smaller or slower fish. Choose tank mates carefully. This is a schooling species — keep at least 6 together, or they may become stressed and display abnormal behavior. Warning: known fin-nipper. Avoid keeping with long-finned species like bettas, angelfish, or fancy guppies. Expected lifespan: 6 years with proper care.

Common Mistakes with Buenos Aires Tetra

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Keeping fewer than 6 together

Buenos Aires Tetra is a schooling species — they need a group of at least 6 to feel secure. Lone or paired individuals become stressed, hide constantly, and may develop health issues or aggression.

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Relying on a heater without a thermometer

Buenos Aires Tetra needs 64–82°F. Heaters malfunction or drift over time — always use a separate thermometer to verify. Temperature swings of even 3–4°F can trigger stress and disease, particularly ich.

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Putting them in a tank under 20 gallons

Many beginners underestimate tank size needs. Buenos Aires Tetra requires at least 20 gallons — ideally 30. Cramped tanks lead to stunted growth, aggression, and poor water quality.

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Housing with peaceful nano fish

Buenos Aires Tetra is semi-aggressive — small, peaceful species like neon tetras, endlers, or celestial pearl danios will be stressed, bullied, or eaten. Choose tank mates that can hold their own.

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Pairing with bettas, angelfish, or fancy guppies

Buenos Aires Tetra is a known fin-nipper. Long-finned fish are irresistible targets — their flowing fins trigger nipping behavior that causes stress, infection, and fin rot in the victim.