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Black Skirt Tetra Care Guide

Gymnocorymbus ternetzi · Easy care · 20 gallon minimum

Updated June 2026
By the AquaStocker team · How we source our data
Black Skirt Tetra (Gymnocorymbus ternetzi)
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A hardy, hexagon-bodied tetra with flowing black fins; can nip long fins so skip slow tankmates.

Adult size2.5"
Min tank20 gal
Temp70–82°F
pH6–7.5
TemperamentPeaceful
SocialGroups of 6+
Care levelEasy
DietOmnivore

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How big does a black skirt tetra get?

A black skirt tetra (Gymnocorymbus ternetzi) reaches about 2.5 inches as an adult. Plan tank size and tank mates around the adult size, not the small fish you buy at the store.

Tank size & setup

Give a black skirt tetra a minimum of 20 gallons, with water at 70–82°F and a pH of 6–7.5. Keep them in groups of at least 6 — they are shoaling fish and become stressed and washed-out alone. As a easy-care, omnivore species, a stable, cycled tank with the right diet keeps them healthiest.

Good tank mates

Pair a black skirt tetra with peaceful species that share its temperature and pH range. Compatible options include:

About the black skirt tetra

The black tetra, also known as the petticoat tetra, high-fin black skirt tetra, black skirt tetra, black widow tetra and blackamoor, is a species of freshwater ray-finned fish belonging to the family Acestrorhamphidae, the American characins.

Recommended gear for black skirt tetras

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FAQ

What size tank does a black skirt tetra need?
At least 20 gallons. Because they shoal, budget for a group of 6+ rather than a single fish. Bigger is always more forgiving for water quality.
Is the black skirt tetra good for beginners?
Yes — it's a easy-care species that tolerates typical community conditions.

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