Blue Tetra

The Blue Tetra (Boehlkea fredcochui) is a beautiful and energetic freshwater fish admired for its metallic blue coloration and active schooling behavior. Native to Peruvian tributaries of the Amazon River, this species inhabits clear streams and rivers surrounded by dense vegetation and submerged roots. Because of its shimmering color and lively personality, the Blue Tetra is a striking addition to planted aquariums and natural aquascapes.

The most distinctive feature of the Blue Tetra is its iridescent blue body, which reflects light beautifully and creates a glowing effect when viewed in a well-lit aquarium. The color often appears as a bright turquoise or electric blue stripe running along the length of the fish, set against a translucent silver body. The fins are generally clear with subtle hints of color, allowing the vibrant blue to remain the dominant visual feature.

Blue Tetras grow to around 4–5 cm (1.5–2 inches) in length and are extremely active swimmers. They are best kept in schools of at least 6–10 individuals, though larger groups will produce more natural schooling behavior and reduce stress. When kept in a proper group, their synchronized movement and shimmering coloration create a dynamic display that enhances planted aquariums.

These fish prefer soft to moderately soft water with stable conditions. Ideal parameters include temperatures between 23–28°C (73–82°F) and a pH range of 6.0–7.5. Because they come from relatively clean river systems, they benefit from good filtration and regular water changes to maintain excellent water quality.

A densely planted aquarium with open swimming areas works best for Blue Tetras. In their natural habitat, they swim in midwater areas surrounded by vegetation and driftwood. Aquascapes with plants such as Rotala, Ludwigia, Vallisneria, Java fern, and mosses help replicate their environment while providing shelter and visual depth. Dark substrates and background plants can further enhance the vibrant blue color of the fish.

Blue Tetras are generally peaceful community fish, though they can be somewhat energetic compared to other small tetras. They do best with other active but non-aggressive species such as rasboras, other tetras, Corydoras catfish, small gouramis, and dwarf cichlids. Because of their active swimming style, they are best kept with fish that enjoy similar water conditions and activity levels.

In terms of feeding, Blue Tetras are omnivorous and easy to feed. They readily accept high-quality flakes, micro pellets, and small granules, but they thrive when given a varied diet that includes live or frozen foods such as brine shrimp, daphnia, and bloodworms. A balanced diet helps maintain their coloration and overall health.

Breeding Blue Tetras in aquariums is possible but not very common in home setups. Like many tetra species, they are egg scatterers that prefer soft, slightly acidic water and dim lighting for spawning. Fine-leaved plants or spawning mops can provide a suitable environment for egg deposition. Adults should be removed after spawning since they may consume the eggs.

With their vivid blue coloration, active schooling behavior, and compatibility with planted aquariums, Blue Tetras are a fantastic choice for aquascaping enthusiasts. When kept in groups within a lush, well-maintained aquarium, they add movement, shimmer, and vibrant color to freshwater aquascapes.