For Cardinals, the GH is recommended to be below 4 and the pH between 4.6 and 6.2. The majority of Cardinal tetras offered in fish stores have been wild caught. The Cardinal tetra is one of the world's most popular aquarium fish species. The best part Cardinal Tetras’ like warmer water temperatures, which is one of the reason why they are so often teamed up with Discus. The cardinal tetra (Paracheirodon axelrodi) is a freshwater fish of the characin family (family Characidae) of order Characiformes.It is native to the upper Orinoco and Negro Rivers in South America. Ein Schulterfleck ist nicht vorhanden. Dorsal (am Rücken) ist der Rote Neon blaugrün irisierend, ventral (zum Bauch hin) kräftig rot gefärbt. We remind you exactly whyâ€¦ What are Cardinal tetras and where do they come from? Rote Neon / Paracheirodon axelrodi werden bis zu 5,0 cm lang, wobei in Gefangenschaftshaltung aufgezogene Tiere größer werden und höhere Wachstumsraten haben.Am Rücken ist der Rote Neon blaugrün irisierend kräftig rot gefärbt. Cardinal Tetra fry grow very slowly and do not start to color up until they are about 8 or 10 or more weeks of age. Roter Neon / Paracheirodon axelrodi / Kardinaltetra. Cardinals need a temperature of 23 to 29 deg C and a 60 cm long tank. Their temperature ranges do not overlap so they are not compatible. Cardinal tetras As you will see from these profiles, paradise fish need a temperature of 10 to 22 deg C and a tank that is at least 80 cm long. This means they are coming from South American rivers, which have extremely soft water with a low pH, and, very warm water temperature. Merkmale. This tiny characin comes from the soft, acidic waters of the Rio Negro drainage in Brazil and reaches just a couple of centimetres in length. Habitat in the wild. Rote Neon werden 2,5 cm SL bis 5,1 cm SL lang, wobei in Aquarienhaltung aufgezogene Tiere größer werden und höhere Wachstumsraten haben. They are sexually mature at 6 to 8 months of age. Cardinal tetra (Paracheirodon axelrodi, Schlutz, 1956) is one of three representatives of Paracheirodon genus, that includes neon tetra (Paracheirodon innesi, Myers, 1936) and green neon tetra (Paracheirodon simulans, Géry, 1963).. And paradise fish need a tank bigger than your 54 litre. Ein Schulterfleck ist nicht vorhanden. So, the GH is another parameter to consider. Cardinal tetra can handle 82º F to 84º F water temperature and in nature the two share similar environments.