Black Skirt Tetras, scientifically known as Gymnocorymbus ternetzi, are popular freshwater fish known for their distinctive black coloration and elegant finnage. They have a sleek and elongated body with a deep black color on their dorsal and anal fins, which gives them their name. The rest of their body is typically silver or gray, creating a striking contrast. Black Skirt Tetras are valued for their visually appealing appearance and make a great addition to community aquariums.

Black Skirt Tetras are native to the Paraguay and Guaporé River basins in South America. In the wild, they inhabit slow-moving rivers and streams with dense vegetation. To replicate their natural habitat, it's recommended to provide them with a well-planted aquarium with open swimming areas. The addition of driftwood and rocks can also provide hiding places and create a visually appealing aquascape.

In terms of behavior, Black Skirt Tetras are generally peaceful and social fish. They prefer to be kept in groups of at least six individuals to create a comfortable shoaling environment. Being in a group not only helps them feel more secure but also enhances their natural schooling behavior. They are active swimmers and will often explore the aquarium, adding liveliness to the tank.

Caring for Black Skirt Tetras involves maintaining suitable water conditions and a well-maintained aquarium. They prefer slightly acidic to neutral water with a moderate temperature range. Good filtration and regular water changes are important to maintain optimal water quality. It's beneficial to provide them with a mix of open swimming areas and planted sections in the tank to accommodate their natural behavior.

Black Skirt Tetras are omnivorous and will accept a variety of foods. In the wild, they feed on small insects, worms, and plant matter. In the aquarium, they can be fed high-quality flake or pellet food designed for small tropical fish. It's also beneficial to supplement their diet with small live or frozen foods such as brine shrimp, daphnia, or bloodworms to provide variety and enhance their overall health.

When selecting tank mates for Black Skirt Tetras, it's important to choose compatible and similarly-sized fish species. They can coexist well with other peaceful community fish, such as other tetras, rasboras, danios, or small catfish. Avoid keeping them with fin-nipping or aggressive fish that may stress or harm them.

Breeding Black Skirt Tetras in captivity can be challenging but is possible with the right conditions. A separate breeding tank with slightly acidic and soft water, along with suitable spawning media such as fine-leaved plants or spawning mops, is recommended. The parents do not provide parental care, and the eggs typically hatch within 24-36 hours. Raising the fry requires providing them with small live or powdered food and maintaining optimal water conditions.

In conclusion, Black Skirt Tetras are visually appealing and popular fish that can enhance the beauty of any freshwater aquarium. With their black and silver coloration, peaceful nature, and ease of care, they are a favored choice among aquarists. By providing them with suitable tank conditions, a balanced diet, and compatible tank mates, Black Skirt Tetras can thrive and create a captivating display in any aquatic setup.