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freshwaterRasbora
Trigonostigma heteromorpha
Also known as: Harlequin Rasbora
BeginnerPeacefulOmnivore
About
The harlequin rasbora is one of the most recognisable community fish: a copper-pink body with a dark triangular patch on the rear half. Native to peat swamps and slow streams in Southeast Asia, it tolerates a range of conditions but shows best colour in planted tanks with clean water and a group of at least six. Mid-water shoalers; peaceful with other small fish. Egg scatterers among fine plants; no parental care.
Feeding & Diet
Flake or small granules; frozen daphnia or brine shrimp; micro foods for small mouths.
Frequency: 1–2× daily
Wedge marking intensifies when fish are settled and water quality is good.
Habitat
Native Region: Southeast Asia (Thailand, Malaysia, Singapore, Sumatra, Borneo)
Blackwater and clear streams with leaf litter and plants.
Planted tank with swimming space; gentle flow; suitable for many community setups.
Behavior
Activity Level: Moderate
Schooling Size: 6+ recommended
Tight school when comfortable; shy in bare or bright tanks.
Breeding
Difficulty: Moderate
Type: Egg scatterer
Sexual Dimorphism: Females deeper-bodied; males slimmer and slightly more intense colour.
Inverted spawning under broad leaves; eggs adhesive; separate adults to reduce egg eating.
Tank Setup
Substrate: Either
Plant Safe: Yes
Broad leaves (e.g. Cryptocoryne) for natural spawning behaviour.
Your tanks
Add this species to a saved tank stocking list.
Care Requirements
Family
Danionidae
Genus
Trigonostigma
Maximum Size
5 cm
Minimum Tank Size
40 liters
Temperature
23-28°C
pH Range
6-7.5
Tank Region
Middle
Lifespan
5–8 years
Growth Rate
Moderate
Min Group Size
6+ fish
Activity Level
Moderate
Breeding Difficulty
Moderate
Breeding Type
Egg scatterer
Native Region
Southeast Asia (Thailand, Malaysia, Singapore, Sumatra, Borneo)
Substrate
Either
Plant Safe
Yes
Good Tank Mates for Harlequin Rasbora
These species are known to coexist peacefully and share compatible water conditions.
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