fish-tank › fish species
Cardinal Tetra (Paracheirodon axelrodi)
Strict soft, acidic blackwater; harder/alkaline water shortens life. Often confused with neons but more demanding.
Specifications
- ecosystem
- freshwater
- min tank gallons
- 20
- adult size in
- 2
- temperature range f
- 73-81
- ph range
- 4.5-6.8
- gh range dgh
- 1-6
- care difficulty
- intermediate
- aggression
- peaceful
- community compatible
- yes
- schooling min count
- 6
- diet
- omnivore
- lifespan years
- 4-6
- tank zone
- middle
Sources
- Aquarium Co-Op video / blog content · ingest 2026-05-06
- Practical Fishkeeping public articles · ingest 2026-05-06
- r/Aquariums + r/PlantedTank + r/ReefTank public threads · ingest 2026-05-06