All species

Harlequin rasbora

Trigonostigma heteromorpha

Also called harlequin, rasbora.

What it needs

Grows to
4.5 cm
Smallest sensible tank
75 L, at least 60 cm long
Temperature
22 to 27 °C
pH
6 to 7.5
Hardness
2 to 12 dGH
Kept in
groups of 8 or more
Temperament
peaceful
Eats
omnivore
Swims
at every level
How hard
easy
Lives
about 6 years

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