Elevate your freshwater aquarium with the Rathbun’s Bloodfin Tetra (Aphyocharax rathbuni), a captivating shoaling species native to rivers in Brazil, Paraguay, Argentina, and Uruguay. Known also as the Green Fire Tetra, these fish grow to about 2 inches (5 cm) and boast a light green body transitioning to a vibrant red on the lower half and tail fins, creating a striking “fire” effect under proper lighting.

Ideal for beginner aquarists, they are hardy, peaceful, and tolerate a wide range of conditions mimicking their wild blackwater habitats. Set up a densely planted tank with fine gravel or sand substrate, driftwood, roots, or river rock for hiding spots and low light to highlight their colors—tall plants or floating vegetation work wonders. Maintain moderate water flow with good filtration and perform 20-25% weekly water changes to keep parameters stable.

Feed small portions twice daily that they consume in 3 minutes: high-quality flakes or pellets as staples, supplemented with frozen or live foods like bloodworms, brine shrimp, daphnia, or tubifex for optimal health and vivid hues. They school beautifully in groups of 6+, making them perfect community tank mates with other tetras, rasboras, or peaceful species—avoid fin-nippers or aggressive cichlids.

Breeding is straightforward for enthusiasts: use a separate tank with fine-leaved plants or spawning mops, soft acidic water, and remove parents post-spawn as eggs hatch in 24-36 hours. Fry start with infusoria, then brine shrimp.