The harlequin rasbora (Trigonostigma heteromorpha) is a peaceful fish that grows to about 2 inches and spends its time in mid-water. Keep at least 6 together, in a tank of 10 gallons or more, at 72–81°F and pH 6–7.5.
10 galsmallest tank
2″adult size
72–81°Ftemperature
6–7.5pH
6+group size
Peacefultemperament
Good tankmates
Avoid
- ✕Paradise fish: Paradise fish is aggressive and best kept alone.
- ✕Angelfish: Angelfish grows big enough to eat Harlequin rasbora.
- ✕Convict cichlid: Convict cichlid is aggressive and best kept alone.
- ✕Oscar: Oscar is aggressive and best kept alone.
- ✕Pea puffer: Pea puffer is aggressive and best kept alone.
From TankCoach's own species data: common hobby guidance for adults, rounded. Individual fish vary. Not veterinary advice.