Long Fin Black Widow Tetra Gymnocorymbus Ternetzi 3cm

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Long Fin Black Widow Tetra (Gymnocorymbus ternetzi)

Overview

The Long Fin Black Widow Tetra is a flowing-finned variant of the classic Black Skirt Tetra, known for its striking black-and-silver body and elegant, elongated fins. Hardy, active, and social, it brings movement and contrast to community aquariums.

Origin

Native to South America, particularly river basins in Paraguay, Brazil, and Argentina. The long-fin morph is selectively captive-bred for the aquarium hobby.

Feeding

Omnivorous and very adaptable. Enjoys flakes, micro-pellets, frozen foods (brine shrimp, daphnia), and occasional live foods to promote colour and vitality.

Tank Mates

Excellent for peaceful community tanks. Suitable companions include rasboras, peaceful tetras, dwarf cichlids, corydoras, and small gouramis. Avoid fin-nipping species due to their delicate, flowing fins.

Aggression

Mostly peaceful with only mild chasing, especially when kept in smaller groups. Best maintained in schools of 6 or more to reduce stress and encourage natural behaviour.

Experience Level

Great for beginners—hardy, adaptable, and easy to care for.

Water Parameters

• Temperature: 72°F – 80°F (22°C – 27°C)

• pH: 6.0 – 7.5

• Hardness: 4 – 15 dGH

Attractive, hardy, and full of movement, the Long Fin Black Widow Tetra adds elegance and personality to any peaceful community aquarium.

Above images for illustration purposes only. Exact colours, patterns, and size may vary between individuals.

Please Note: The livestock that is sold on our online site is not held in store at our Swell shop, or available for collection from the shop. Species sold at our Swell store will differ from ones available to order to your door.

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