Red neon
Paracheirodon axelrodi
Profile
The cardinalfish is a distinct schooling fish and should be kept in groups of at least 10–15 individuals.
Family: Characins (Characidae)
Home: South America: Blackwater rivers in the upper Orinoco and Rio Negro region (Brazil, Venezuela, Colombia)
Synonyms: Cardinal tetra, red neon, cardinal tetra
First introduced: Represented in the aquarium hobby since the 1960s.
Size: Approx. 4–5 cm
Sexual differences: Females are somewhat fuller and rounder. Males are slimmer. Sexual differences very subtle
Diet: Fine food eater Flake and granulated food (fine) Frozen food: Cyclops, Artemia, Daphnia Live food increases colour intensity High-quality, varied food recommended
Temperature: 24–30 °C (ideal 26–28 °C)
Tank size: From 80 litres upwards, but for larger shoals rather 120 litres+
Water values: pH: 4.5–6.8 (slightly acidic ideal) / GH: 1–8 °dGH (soft)
Profile red neon / cardinalfish
Area of origin
The cardinal tetra inhabits the dark, blackwater rivers of theAmazonas region. There, the water is very soft, acidic, rich in humic substances and heavily overgrown with plants and roots.
Species
Paracheirodon axelrodi is one of three Paracheirodon species: Species commonly offered in the pet trade include:
- Paracheirodon axelrodi - Cardinalfish (solid red lower body)
- Paracheirodon innesi - neon fish (red stripe only at the back)
- Paracheirodon simulans - Blue neon / Green neon (smaller, more delicate)
Social behaviour
Very peaceful. Shows harmonious, synchronised swimming behaviour in a shoal. Ideal for community tanks with calm species. Intense colours in larger groups. Shy in groups that are too small or with hectic tankmates.
Keeping conditions
Soft, slightly acidic water. Dark substrate and subdued light. Lots of plants, roots, leaf litter. Good filtration, but no strong current. Regular water changes important. Very sensitive to nitrite
Breeding
Sophisticated Requires soft, very acidic water. Twilight promotes readiness to spawn. Free spawners, eggs are scattered. Parents must be removed immediately after laying eggs. Eggs are sensitive to light → darken! Breeding the tiny fry requires infusoria
Special features
One of the most colourful freshwater fish species Blackwater requirements → ideal for biotope aquariums. Requires stable water conditions. Stress-free in large groups
Conclusion
Paracheirodon axelrodi is a particularly colourful, peaceful schooling fish that unfolds its full beauty in a soft, acidic and densely planted aquarium. It is ideal for quiet community tanks and blackwater aquariums. It displays fascinating, harmonious shoaling behaviour in groups.
If you have any questions or problems, our trained team at Zoo Roco is here to help. They can provide expert advice on all matters.
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