All species

Swordtail

Xiphophorus hellerii

What it needs

Grows to
10 cm
Smallest sensible tank
150 L, at least 90 cm long
Temperature
22 to 28 °C
pH
7 to 8.4
Hardness
12 to 30 dGH
Kept in
groups of 3 or more
Temperament
semi-aggressive
Eats
omnivore
Swims
at every level
How hard
easy

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