Cardinal Tetra

Paracheirodon axelrodi

Like a neon tetra, but the red runs the full length of the body — and it prefers warmer, softer water.

Water

Freshwater

Temperature

73–82°F

pH

4.5–6.8

Hardness

1–8 dGH

Max size

2 in

Min tank

15 gal

Temperament

Peaceful

Social

Schooling (6+)

Swim level

Middle

Diet

Omnivore

Care level

Intermediate

Lifespan

4-6 years

Breeding

Egg-scatterer

Suitability

Common

Origin

Upper Orinoco and Negro river basins

Cardinals are slightly larger and more color-rich than neons, with red along the entire belly. They want warm, soft, acidic blackwater-style conditions and look spectacular in large schools.