Harlequin rasbora size: how big does it get?

Adults reach about 4.5 cm. The largest on record measured 5 cm (total length). Record sizes among the 4 Trigonostigma species on LumaReef: 2.5 cm (Lambchop rasbora) to 10.5 cm (Somphongs's Rasbora).

Harlequin rasbora tank size: what is the minimum?

A tank at least 60 cm long. In LumaReef that is the Nano tank or larger.

Harlequin rasbora water parameters: what does it need?

Temperature 22–27 °C, pH 6.0–7.5, hardness 2–12 °dGH. Close to what most Trigonostigma on LumaReef need (23–28 °C).

Harlequin rasbora tank mates: what can it live with?

It gets along with 80 of the 99 freshwater species in the catalogue, such as Cardinal tetra, Lemon tetra, and Penguin tetra.

FreshwaterIn the market70 coinsCommon

Harlequin rasbora

Trigonostigma heteromorpha

It moves through mid-water as an unhurried and orderly shoal.

The Harlequin rasbora (Trigonostigma heteromorpha) is a tropical freshwater fish of the family Danionidae. It swims in midwater, close to the bottom. Adults grow to about 4.5 cm; the largest on record measured 5 cm (total length). In the aquarium it needs a tank at least 60 cm long and water at 22–27 °C.

Size: 4.5 cm
Smallest tank: 60 cm
Temperature: 22–27 °C
Care: Easy

In the aquarium

Temperature22–27 °C

pH6.0–7.5

Hardness2–12 °dGH

Temperament: Peaceful
Diet: Omnivore
Activity: Moderate
Water layer: Mid water
Group: Happiest in a group of 8 or more
Plants: Plant safe

These values are compiled from real species data, and the LumaReef simulation is built to keep them true to life.

Which tank it fits

Nano60 cm · 65 litres21 of them
Standard90 cm · 180 litres60 of them
Wide120 cm · 300 litres100 of them
Living room180 cm · 650 litres216 of them
Showcase250 cm · 1,200 litres400 of them
Gallery300 cm · 1,440 litres480 of them

Who it lives with

Gets along80 species

and 56 more species

Caution8 species

Narrow shared temperature range

Not together11 species

Aggressive with peaceful

Water temperatures do not overlap

In the wild

Water type: Freshwater
Climate zone: Tropical
Habitat: Midwater, close to the bottom
Largest on record: 5 cmtotal length
Aquarium trade: Very common

Conservation status

Classification

OrderCypriniformes
FamilyDanionidae
GenusTrigonostigma
SpeciesTrigonostigma heteromorpha
Described byDuncker, 1904

In other languages

German: Keilfleckbärbling
Russian: Расбора-гетероморфа
Japanese: バチウオ

Quick answers

Harlequin rasbora size: how big does it get?: Adults reach about 4.5 cm. The largest on record measured 5 cm (total length). Record sizes among the 4 Trigonostigma species on LumaReef: 2.5 cm (Lambchop rasbora) to 10.5 cm (Somphongs's Rasbora).
Harlequin rasbora tank size: what is the minimum?: A tank at least 60 cm long. In LumaReef that is the Nano tank or larger.
Harlequin rasbora water parameters: what does it need?: Temperature 22–27 °C, pH 6.0–7.5, hardness 2–12 °dGH. Close to what most Trigonostigma on LumaReef need (23–28 °C).
Harlequin rasbora tank mates: what can it live with?: It gets along with 80 of the 99 freshwater species in the catalogue, such as Cardinal tetra, Lemon tetra, and Penguin tetra.
Harlequin rasbora: alone or in a group?: Keep at least 8 together.
Harlequin rasbora and plants: is it plant safe?: Yes, it leaves plants alone.