Save the Little Fish

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Black skirt tetra, Gymnocorymbus ternetzi

Tetras · Gymnocorymbus

Black skirt tetra

Gymnocorymbus ternetzi · Paraguay and Guaporé basins

Photo: emptyvi, CC BY-SA 3.0, via Wikimedia Commons

The Black skirt tetra (Gymnocorymbus ternetzi) is a freshwater fish from Paraguay and Guaporé basins, where it lives in river habitat. Adults reach about 6 cm (2.4 in). Keep it at 21–27 °C (70–81 °F) and pH 6–7.5, with a gentle current. It is semi-aggressive and does best in a group of 6 or more. It eats most foods: flakes, small pellets and frozen foods.

At a glance

Water temperature

21–27 °C 70–81 °F

pH

6–7.5 neutral water

Adult size

6 cm 2.4 in

Swims

Mid-water mostly in open water

Keep together

6 or more a shoal feels safe

Current

Gentle a steady gentle flow

Food

Eats most foods

Temperament

Semi-aggressive

≈ Every value here is an estimate from typical hobby ranges. We're checking them against sources.

Where it comes from

Home water

Paraguay and Guaporé basins

Lives in river habitat.

The dot marks where it's collected. Home from iNaturalist native sightings (12). Map: Natural Earth.

Tank mates

Checked against a roomy 300 L planted tank with moderate flow and plenty of caves. Your own tank may change the answer: try it in Your tanks.

In the hobby

In stock now

Not in stock at any store we track.

Tanks with this fish

No shared tanks have this fish yet. Share yours from Your tanks.

From keepers

Notes appear here when a keeper shares a tank with this fish and writes about it.

Questions keepers ask

How big does a Black skirt tetra get?

About 6 cm (2.4 in) as an adult.

What temperature does a Black skirt tetra need?

21–27 °C (70–81 °F).

What pH does a Black skirt tetra need?

pH 6–7.5.

Does a Black skirt tetra need to be kept in a group?

Yes. Keep at least 6.

Is the Black skirt tetra aggressive?

It can be. It is semi-aggressive, so choose tank mates carefully.

What does a Black skirt tetra eat?

It eats most foods: flakes, small pellets and frozen foods.

Where does the Black skirt tetra come from?

Paraguay and Guaporé basins.

What fish can live with a Black skirt tetra?

Good tank mates include Candy stripe (L015), Leopard frog (L134), Amano shrimp, Bolivian ram, Bronze corydoras.

All the numbers

Temperature min (°C)21 Estimate
Temperature max (°C)27 Estimate
pH min6 Estimate
pH max7.5 Estimate
Adult size (cm)6 Estimate
FlowModerate Estimate
Habitatriver Estimate
Smallest happy group6 Estimate
TemperamentSemi-aggressive Estimate
DietOmnivore Estimate
Behaviour tagsfin_nipper Estimate
Typical price min (CAD)3 Estimate
Typical price max (CAD)5 Estimate

Some values are estimates from typical hobby ranges and haven't been checked against a source yet.