Tetra / Aquarium Zone · Ballina
Gymnocorymbus ternetzi
A peaceful community fish. Grows to about 5 cm and suits a tank of 60 litres or more.
The fish, up close
The Black Widow Tetra, scientifically known as Gymnocorymbus ternetzi, is a striking freshwater fish with a sleek elongated body that is predominantly silver with a distinctive black triangular patch on its caudal peduncle resembling a widow's peak. The fins of this tetra are transparent with delicate hints of red. These fish are peaceful and active swimmers, making them an attractive addition to community aquariums. They prefer planted tanks with ample swimming space and subdued lighting to mimic their natural habitat.
Care guide
Use these notes to shape a setup around the fish, then speak with our team about the tank you have in mind.
Plan your setupBehaviour
Black Widow Tetras are known for their peaceful nature, making them excellent community tank inhabitants. They are shoaling fish, so they should be kept in groups of at least six to thrive. These tetras are active swimmers and enjoy exploring their environment. They may exhibit some fin-nipping behaviour, especially towards fish with long fins, so tank mates should be chosen carefully.
Tank planning
Maintaining stable water parameters is crucial for the health of Black Widow Tetras. They prefer slightly acidic water with a pH between 6.5-7.5 and a temperature range of 24-27°C. Regular water changes and a well-maintained filtration system are essential to keep their environment clean. Provide plenty of hiding spots and plants to create a sense of security for these tetras.
Practical details
Questions
For a specific fish, current stock or a tank setup question, speak with the Aquarium Zone team before travelling.
Contact the storeAquarium Zone regularly helps customers find freshwater fish in Ballina and across the Northern Rivers. Stock changes week to week, so contact the store before visiting if you are looking for Black Widow Tetra.
Yes. Bring your tank size, current fish list, setup photos, and any water test results so the team can help with compatibility, stocking, and care advice.
Black Widow Tetra is listed with this tank recommendation: A minimum tank size of 60 litres is recommended for a small group of Black Widow Tetras. Larger tanks are preferable if keeping a larger shoal or adding other fish species to the community setup. Ask in-store for advice based on your exact setup and tank mates.
Yes. Aquarium Zone serves aquarium hobbyists from Ballina, Lennox Head, Alstonville, Wollongbar, Bangalow, Byron Bay, Lismore, Evans Head, Mullumbimby, Casino and the wider Northern Rivers.
Aquarium Zone / Ballina
Looking for Black Widow Tetra? Contact us to confirm current availability and discuss whether it suits your aquarium before making the trip.
18 Southern Cross Drive
