Longfin Black Widow Tetra (Gymnocorymbus ternetzi)The Longfin Black Widow Tetra, also known as the Black Skirt Tetra, is a striking and elegant variation of the classic Black Widow Tetra. Known for its flowing fins and distinct black and silver body, this hardy fish originates from South America and is a favourite among aquarists seeking a graceful addition to community tanks.AppearanceThe Longfin Black Widow Tetra features a deep silver body with bold black vertical stripes near the head and midsection. Its long, flowing fins give it a dramatic and elegant look, adding beauty to any aquarium. Growing up to 5-6 cm in size, this fish stands out in schools and complements a planted tank beautifully.Aquarium CareTo keep Longfin Black Widow Tetras healthy, provide a tank of at least 70 litres with soft to moderately hard water. Maintain a pH range of 6.0 to 7.5 and a temperature between 22°C and 27°C. A well-planted tank with open swimming areas is ideal, while dim lighting enhances their natural colouring. Regular water changes and efficient filtration help maintain optimal water conditions.Tank MatesThese peaceful schooling fish thrive in groups of 6 or more, which helps them feel secure and display natural behaviours. They are compatible with other non-aggressive tank mates such as rasboras, Corydoras catfish, and other small to medium-sized tetras. Avoid pairing them with larger or aggressive species that may nip at their delicate fins.Feeding & NutritionLongfin Black Widow Tetras are omnivorous and enjoy a varied diet. Provide high-quality flakes or micro pellets as their staple food, supplemented with live or frozen options like brine shrimp, daphnia, and bloodworms. Including occasional plant-based foods, such as spirulina flakes or blanched vegetables, ensures balanced nutrition. Feed them 2-3 times daily in small portions.LifespanWith proper care, Longfin Black Widow Tetras can live up to 5 years, bringing consistent elegance and activity to your aquarium.FAQsWhat size tank is ideal for Longfin Black Widow Tetras? A tank of at least 70 litres with plants and open swimming areas is recommended.Can Longfin Black Widow Tetras live with other fish? Yes, they thrive in community tanks with peaceful, similarly sized species.How often should I feed my Longfin Black Widow Tetras? Feed them 2-3 times daily with a varied diet of flakes, pellets, and live or frozen foods.Do Longfin Black Widow Tetras need to be in groups? Yes, they are schooling fish and should be kept in groups of at least 6 for natural behaviour.How long do Longfin Black Widow Tetras live? With proper care, they can live up to 5 years in a well-maintained aquarium.Species OverviewSpecies: Gymnocorymbus ternetziCommon Name: Longfin Black Widow TetraOrigin: South AmericaDiet: OmnivorePH Range: 6.0 – 7.5Temperature: 22°C – 27°CMax Size: Approximately 5-6 cmSex: Sold un-sexed