Cardinal Tetra Care Sheet
IntermediateParacheirodon axelrodi · fish
Cardinal tetras are vibrant South American schooling fish requiring soft, acidic water and stable conditions. They are best kept in groups of 6 or more in a well-planted tank.
Quick care stats
Adult size1.5-2 inches
Lifespan3-5 years
Min tank size10 gallons
Water temp74-80F
pH6.0-7.0
Hardness2-10 dGH
Temperamentpeaceful
Group / schoolinggroup of 6+
Tank matesOther peaceful community fish such as small rasboras, tetras, and dwarf cichlids.
DietHigh-quality flakes, micro pellets, and frozen foods like bloodworms and brine shrimp; feed small portions 2-3 times daily.
What you need (full setup)
🔧 Tank (10 gallon min)Provides stable water volume and swimming space for a school.🔧 Filter (sponge or hang-on-back)Maintains water quality and gentle current suitable for tetras.🔧 Adjustable heaterKeeps temperature stable within 74-80F range.🔧 ThermometerMonitors water temperature accurately.🔧 Fine sand or smooth gravel substrateMimics natural habitat and is gentle on fish.🔧 Water conditioner (dechlorinator)Removes chlorine/chloramine from tap water.🔧 Test kit (liquid, for pH, ammonia, nitrite, nitrate)Essential for monitoring water parameters and preventing issues.🔧 Live plants and driftwoodProvides cover and replicates blackwater environment, reducing stress.
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Common health issues
- Ich (white spot disease)
- Neon tetra disease (Pleistophora)
- Fin rot
⚠️ For any sign of illness (not eating, lethargy, swelling, retained shed), see a qualified exotics vet. Care sheets are general guidance only.