All species

Cardinal tetra

Paracheirodon axelrodi

What it needs

Grows to
4.5 cm
Smallest sensible tank
80 L, at least 60 cm long
Temperature
23 to 28 °C
pH
4.5 to 6.8
Hardness
1 to 8 dGH
Kept in
groups of 6 or more
Temperament
peaceful
Eats
omnivore
Swims
at every level
How hard
moderate
Lives
about 5 years

These are the figures the stocking advice is built on. Make a room and it will tell you whether cardinal tetra fit the tank you have.