The Cardinal Tetra (Paracheirodon axelrodi) is one of the most popular and colorful freshwater fish in the aquarium hobby. Known for its brilliant blue stripe and vivid red body, this peaceful schooling fish adds a beautiful flash of color to any community tank.

Native to the slow-moving blackwater rivers of South America, especially in the Rio Negro and Orinoco basins, the Cardinal Tetra thrives in warm, soft, and slightly acidic water. Their natural habitat is shaded by dense vegetation and leaf litter, which gives the water its characteristic dark tint.

Cardinal Tetras grow to about 2 inches in length and should always be kept in groups of at least six or more, as they are social fish that feel safest when schooling. A well-planted tank with subdued lighting and gentle water flow helps mimic their natural environment and keeps them comfortable.

They do best in temperatures between 75°F and 82°F with a pH range of 5.0 to 7.0. Since they are sensitive to poor water quality, regular water changes and a good filtration system are important.

Cardinal Tetras are omnivores and will readily accept a variety of foods such as high-quality flake, micro pellets, frozen daphnia, and baby brine shrimp. Offering a mix of live and prepared foods helps maintain their vibrant colors and health.

Peaceful by nature, Cardinal Tetras make excellent tank mates for other small, non-aggressive species like rasboras, dwarf corydoras, and small gouramis. They should not be kept with larger or aggressive fish that might see them as food.

With proper care, Cardinal Tetras can live up to 5 years in captivity. Their beauty, calm temperament, and schooling behavior make them a favorite choice for aquascapes and community aquariums alike.