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The Black Skirt Tetra (Gymnocorymbus ternetzi) is a popular and hardy freshwater fish, well-loved for its distinctive appearance and active nature. Originating from the Paraná, Paraguay, and Guaporé River basins in South America, these characins are recognizable by their striking black and silver-grey coloration. They feature two prominent vertical black stripes near their gills and a large, flowing black anal fin that resembles a 'skirt,' giving them their common name. Growing to about 2.5 inches (6 cm), Black Skirt Tetras are schooling fish and thrive in groups of six or more, displaying their most natural behaviors and reducing stress. They are relatively peaceful, making them suitable for community aquariums, though their fin-nipping tendencies with long-finned tankmates should be noted. An ideal tank setup includes densely planted areas for cover, open swimming spaces, and a dark substrate to enhance their colors. They are unfussy eaters, readily accepting high-quality flake food, pellets, and occasional live or frozen treats like bloodworms or brine shrimp. Water parameters should be soft to medium-hard with a pH of 6.0-7.5 and temperatures between 72-79°F (22-26°C). With proper care, Black Skirt Tetras can live for 3-5 years, providing an engaging and dynamic presence in any well-maintained aquarium.

Known fin-nipper; keep in large schools (8+) to reduce aggression.