Cardinal Tetra
Cardinal Tetra (Paracheirodon axelrodi) is an attractive aquarium fish from Brazil, Colombia, Venezuela (Rio Negro, Rio Orinoco).
Feeding & Care Tip: Hikari Micro Pellets makes an excellent daily staple. Supplement 2–3× per week with Hikari Frozen or Freeze-Dried Baby Brine Shrimp, Hikari Frozen or Freeze-Dried Tubifex Worms to maintain best condition and color. Feed small amounts 2–3 times daily.
Native to Brazil, Colombia, Venezuela (Rio Negro, Rio Orinoco). In the aquarium, a planted setup with the ideal parameters listed below and stable, clean water produces the best coloration and health.
Keep in groups of at least 8. As with most schooling species, larger groups produce more natural behavior and richer color. See Notes for any important care considerations.
A rewarding addition to the planted aquarium, offering attractive coloration and peaceful nature in a well-managed community setup.
Care & Ideal Parameters
| Difficulty | Easy — Moderate |
| Temperament | Peaceful — Community |
| Typical Adult Size | 1.75 inches (4.5 cm) |
| Min. Group Size | 8 minimum — groups of 15+ produce best color and schooling |
| Ideal Temp | 73–81°F (23–27°C) |
| Ideal pH | 6.0–7.0 |
| Ideal GH | 1–8 dGH |
| Ideal KH | 0–4 dKH |
| Staple Food | Hikari Micro Pellets |
| Treat / Supplement | Hikari Frozen or Freeze-Dried Baby Brine Shrimp, Hikari Frozen or Freeze-Dried Tubifex Worms |
| Origin | Brazil, Colombia, Venezuela (Rio Negro, Rio Orinoco) |
| Notes | Full-length red belly distinguishes it from Neon Tetra. Tank-raised specimens adapt well to pH up to 7.0. More sensitive to water quality than Neon. |
