The Broken-line Tetra, scientifically named Hemigrammus ulreyi, is a charming and lesser-known species within the aquarium hobby, native to the clear streams and rivers of South America, particularly in regions such as Brazil. This species belongs to the Characidae family, which includes many popular and colorful tetras known for their peaceful nature and schooling behavior. The Broken-line Tetra is distinguished by its subtle beauty, characterized by a silver body with a distinctive, irregular dark line that runs along its side, giving the appearance of being "broken" in parts, hence its common name.

Hemigrammus ulreyi is a relatively small species, making it an excellent choice for community aquariums with other peaceful fish of similar size. Their schooling nature not only enhances their own sense of security but also creates a visually appealing display as they move in unison through the water. To replicate their natural environment and encourage their natural behaviors, the aquarium should include plenty of plants, both floating and rooted, to provide cover and mimic the densely vegetated waterways of their habitat.

The diet of the Broken-line Tetra is omnivorous, with a preference for small invertebrates and plant matter in the wild. In captivity, they thrive on a varied diet that includes high-quality flake food, micro pellets, and live or frozen foods such as brine shrimp, daphnia, and bloodworms. Offering a balanced diet is crucial for maintaining their health and enhancing their natural colors.

Breeding Hemigrammus ulreyi can be a rewarding experience for aquarists. Like many tetras, they are egg scatterers, releasing their eggs among fine-leaved plants or a spawning mop. The breeding process can be encouraged by providing optimal water conditions, including slightly softer and more acidic water, and a diet rich in live foods. After spawning, it is advisable to remove the adults from the breeding tank to prevent them from consuming the eggs, as they do not exhibit parental care.

Caring for the Broken-line Tetra involves maintaining clean, well-oxygenated water with stable temperature and pH levels. Regular water changes and careful monitoring of water parameters are essential to keep these fish healthy and stress-free. Their peaceful and sociable nature makes them compatible with a wide range of other community fish, provided that care is taken to avoid larger or more aggressive species that might bully or outcompete them for food.

In summary, Hemigrammus ulreyi offers a unique blend of subtle beauty and engaging behavior, making it a delightful addition to the freshwater aquarium. While they may require some attention to their specific dietary and environmental needs, the Broken-line Tetra is a manageable species for aquarists of all levels, adding a touch of elegance and activity to any community tank.