Description
Cardinal Tetra (Paracheirodon axelrodi)
📌 Basic Info
Scientific Name: Paracheirodon axelrodi
Size: Up to 2 inches (5 cm)
Lifespan: 4–6 years
Tank Zone: Middle swimmers
🌊 Water Parameters
TDS (Total Dissolved Solids): 80 – 150 ppm
pH: 5.0 – 6.5 (soft & acidic)
Temperature: 24°C – 28°C (75°F – 82°F)
Water Type: Soft, slightly acidic, clean water
🐟 Characteristics
Peaceful, schooling fish with a bright blue stripe and full red belly (red runs from head to tail, unlike Neon Tetras).
Active swimmers, thrive in planted tanks.
Shy when alone but very confident in groups.
🍽️ Food
Type: Omnivorous
Diet: Micro-pellets, flakes, frozen/live foods (daphnia, brine shrimp, bloodworms)
Feeding Frequency: 1–2 times daily in small amounts
🛠️ Maintenance
Weekly water change: 20–30%
Needs stable water (very sensitive to sudden changes)
Prefers heavily planted tanks with driftwood & shaded areas
Gentle filtration, dim lighting recommended
👥 Social Behavior
Minimum Group Size: 8–10 (the bigger the group, the healthier they are)
Tank Mates: Peaceful species – rasboras, small tetras, guppies, mollies, corydoras, dwarf gouramis, shrimps, and snails
Avoid: Aggressive fish (bettas, barbs, large cichlids)
✅ Do’s
Keep in larger groups to reduce stress
Provide soft, acidic water conditions
Add plants, roots, or driftwood for hiding spots
❌ Don’ts
Don’t keep in hard, alkaline water
Don’t keep less than 6–8 fish (they get stressed)
Don’t add aggressive or fin-nipping tank mates
⭐ Quick Tips
Cardinal Tetras are more sensitive than Neon Tetras
Ideal for planted community aquariums
Best for hobbyists with some aquarium experience
