Cardinal Tetras are vibrant freshwater fish prized for their striking red and blue coloration, making them a centerpiece species in planted and community aquariums. These small, peaceful schooling fish thrive in groups of six or more and prefer soft, slightly acidic water with temperatures between 23–25°C. Native to South American blackwater streams, they're ideal for experienced aquarists seeking to replicate natural biotope conditions. Their active, graceful swimming patterns and compatibility with other non-aggressive species create dynamic, visually compelling displays. Proper nutrition, stable water parameters, and adequate space ensure longevity and vibrant coloration.