The route of the Cardinal Tetra One of the aquarium fish with more pages held in the books of hobbyists than Discus and Angelfish combined is the Cardinal tetra. More precisely, Paracheirodon axelrodi. These characids we could consider as the most popular tetras in the ornamental fish hobby, their distinctive color contrast and beauty makes them unique and although there are several similar tetras such as the Paracheirodon inessi (previously in the genus Hyphessobrycon) or P. simulans, they do not possess the elegance of that of the King of the tetras. Such is the importance of this characid, whole families …