Cardinal Tetra

Paracheirodon axelrodi

Minimum Tank Size

15–20 gal

Temperature

75–84°F

PH

4.5–7.5

Adult Size

1.5–2 in

Temperament 

Peaceful schooling fish

Care Difficulty

Intermediate

Diet & Feeding

Feed a varied, species-appropriate diet built around a quality prepared staple, with frozen/live or plant foods as appropriate. Avoid overfeeding.

Care Instructions

Maintain stable 75–84°F water, appropriate water chemistry, regular partial water changes, and enough space for an adult Cardinal Tetra.

Flow & Filtration

Use mature biological filtration, good oxygenation, and flow appropriate to the species. Maintain consistently low ammonia and nitrite.

Planted Tank Suitability

Suitable when plants and layout match the species; protect plants from digging or grazing where necessary.

Tank Mate Compatibility

Good Tank Mates
  • Discus
  • Corydoras sterbai
  • Rasboras

Use Caution 
  • Angelfish
  • Betta

Avoid
  • Oscar
  • Goldfish

Compatibility Notes

Warm-water schooling species; especially useful in peaceful discus-style communities.

Breeding Notes

Breeding requirements vary; use a dedicated setup when attempting to raise eggs or fry.