Cardinal Tetra (Paracheirodon axelrodi) – Vibrant Schooling Fish for Peaceful Community Aquariums

The Cardinal Tetra (Paracheirodon axelrodi) is a striking and peaceful freshwater species native to South America, found throughout the Orinoco River basin, the Rio Negro, and extending as far west as Colombia. Known for its vivid coloration and social behavior, this species is highly favored among aquarists seeking a vibrant, active presence in well-maintained community aquariums.

Cardinal Tetras thrive in soft, acidic water environments and prefer stable, mature tanks with subdued lighting and gentle flow. Their natural habitat includes shaded, slow-moving waters beneath dense rainforest canopies—conditions that should be replicated in aquaria to ensure their health and vivid coloration.

Features & Advantages

• Striking Appearance: Features a neon blue stripe extending from nose to tail, complemented by a full-length brilliant red stripe. The contrast against transparent fins and a soft white underbelly makes this species exceptionally eye-catching.

• Peaceful Schooling Fish: Highly social and non-aggressive, ideal for community aquariums with other peaceful species. Best kept in schools of six or more to encourage natural behavior.

• High Visual Impact: Creates stunning visual displays when kept in large shoals, often numbering in the dozens. Particularly effective in well-planted tanks with open swimming areas.

• Diet & Feeding: Omnivorous and easy to feed. Accepts high-quality flakes, micropellets, and live or frozen foods. High vitamin content in their diet supports vibrant coloration and overall health.

• Environmental Needs: Prefers soft (≤4 dGH), acidic water (pH <6.0) and temperatures between 23–27°C (73–81°F). Floating plants and dim lighting replicate natural conditions and reduce stress.

• Color Varieties Available: Includes Gold and Albino variants for aquarists seeking unique color patterns.

Note: Cardinal Tetras are sensitive to water quality and not recommended for newly established tanks. Consistent parameters and a mature, well-cycled environment are essential for their long-term well-being.

These tetras are a perfect addition for aquarists seeking both beauty and harmony in a peaceful community setup.