Harlequin Rasbora – Beautiful Copper-Orange Freshwater Schooling Fish
The Harlequin Rasbora (Trigonostigma heteromorpha) is one of the most popular freshwater aquarium fish, admired for its beautiful copper-orange coloration, distinctive black triangular marking, and peaceful schooling behaviour.
Native to the tropical freshwater habitats of Southeast Asia, this elegant species features a shimmering orange-pink body highlighted by a bold black wedge-shaped pattern along its rear half.
Harlequin Rasboras are peaceful, hardy, and highly social fish that thrive in groups, creating a beautiful display as they swim together through planted aquariums.
Their compact adult size makes them an excellent choice for medium-sized community aquariums, where they coexist well with other peaceful species such as small tetras, Corydoras, and dwarf gouramis.
Easy to care for and visually striking, the Harlequin Rasbora is a fantastic choice for both beginner and experienced aquarists looking to add colour, movement, and natural beauty to their freshwater aquarium.
Care Guide
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Parameter
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Details
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Scientific Name
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Trigonostigma heteromorpha
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Former Scientific Name
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Rasbora heteromorpha
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Common Name
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Harlequin Rasbora
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Origin
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Southeast Asia
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Adult Size
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Approximately 4–5 cm
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Temperature
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21–28°C
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pH
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5.0–7.5
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Water Hardness
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1–12 dGH
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Minimum Tank Size
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60–70 L+ for a group
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Minimum Tank Length
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60 cm
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Diet
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Omnivore / Micropredator
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Temperament
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Very Peaceful
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Care Level
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Beginner
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Group Size
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8–10 minimum; larger groups preferred
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Lifespan
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Approximately 5–8 years
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Swimming Level
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Middle
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Water Flow
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Gentle to Moderate
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Aquarium Type
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Planted Aquarium / Community Aquarium
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Special Requirements
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Group housing, plants, open swimming space
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