Cardinal Tetra
Paracheirodon axelrodi
About
The cardinal tetra is a classic blackwater characin closely related to the neon tetra. The full-length red band (not just the rear half like the neon) and rich blue make it a showpiece in planted aquaria. Wild populations occur in soft, acidic rivers in the upper Orinoco and Rio Negro basins. They need stable, warm water (about 24–28 °C) and soft to moderately soft conditions to thrive; they are less forgiving of cool or hard water than many neons. Keep in groups of at least six, ideally ten or more, in a mature planted tank with gentle flow and subdued lighting.
Feeding & Diet
Small flake or micro pellets; frozen daphnia, brine shrimp, or cyclops; occasional live foods in tiny portions.
Frequency: 1–2× daily
Feed variety for best colour; avoid overfeeding in soft-water setups.
Habitat
Native Region: South America (upper Orinoco and Rio Negro basins)
Tannin-stained forest streams and floodplains; leaf litter, roots, low conductivity.
Soft water, stable warmth, mature filter, plants and driftwood; avoid temperature swings.
Behavior
Activity Level: Moderate
Schooling Size: 6+ recommended
Schools tightly in suitable water; colour may dull in poor conditions or small groups.
Breeding
Difficulty: Difficult
Type: Egg scatterer
Sexual Dimorphism: Females often plumper when carrying eggs.
Requires very soft, acidic water and often dim light; eggs are adhesive and easily eaten; dedicated breeding setup usual.
Tank Setup
Substrate: Either
Plant Safe: Yes
Dark substrate and botanicals can enhance colour; leave open swimming room.
Your tanks
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Care Requirements
Similar Tetra Fish
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