The Blue Tetra, scientifically known as Knodus borki, is a captivating species in the aquarium hobby, renowned for its stunning iridescent blue coloration that makes it a sought-after addition to community tanks. Native to the clear waters of South America, particularly in Colombia and Venezuela, this species thrives in environments that mimic the soft, acidic conditions of their natural habitat.

Blue Tetras exhibit a slender, elongated body shape that is typical of many tetra species, with males often displaying more intense coloration and slightly slimmer profiles compared to females. Their peaceful nature and schooling behavior make them ideal candidates for community aquariums, where they can be kept with other similarly sized and tempered fish to create a dynamic and visually appealing display.

Dietary needs for the Blue Tetra are omnivorous, with a preference for a varied diet that includes high-quality flake foods, micro pellets, and regular servings of live or frozen foods such as brine shrimp, daphnia, and bloodworms. Such a diet not only ensures their nutritional needs are met but also helps maintain their vibrant coloration and overall health.

Breeding Knodus borki can be a challenge but is certainly achievable for dedicated hobbyists. They are egg scatterers, with females releasing eggs among fine-leaved plants or spawning mops, where the male fertilizes them. To increase the chances of successful breeding, it's advisable to condition the breeding pair with high-quality live foods and to set up a dedicated breeding tank with optimal water conditions and plenty of cover for the eggs.

Caring for the Blue Tetra involves replicating the conditions of their natural habitat as closely as possible. This includes maintaining soft, slightly acidic water, providing ample hiding places and territories through the use of plants and driftwood, and ensuring the tank is well-oxygenated with a gentle flow. Regular water changes and diligent monitoring of water parameters are crucial to keeping these fish healthy and stress-free.

In summary, the Blue Tetra, Knodus borki, offers an excellent opportunity for aquarists to add a splash of color and activity to their freshwater setups. Their care, while necessitating attention to diet, water quality, and environmental enrichment, is rewarded with the pleasure of observing these beautiful and peaceful fish as they interact with their surroundings and each other. For those willing to meet their needs, the Blue Tetra can be a delightful and vibrant addition to a diverse and harmonious community aquarium.