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Species library

Harlequin Rasbora

Trigonostigma heteromorpha

Cyprinidae

FishDifficulty: ●●○○○Data: well-established

About

The harlequin rasbora is a hardy, peaceful cyprinid from the peat swamps and blackwater streams of the Malay Peninsula, Sumatra and Thailand. It is instantly recognised by the black wedge-shaped 'harlequin' patch on its coppery-pink flanks. Adaptable and long-lived, it is one of the best beginner shoaling fish, forming coordinated groups that move beautifully through planted community aquaria.

Care

Keep in shoals of 8+ in a planted tank with soft to moderately hard water and gentle flow. Very adaptable and peaceful, ideal for community setups.

Diet

Easygoing omnivore; feed a varied diet of dry foods plus frozen/live foods for best colour.

Tankmate compatibility

Possible with care (85)

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Avoid (24)

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Computed by the AquaSage engine for a spacious reference tank — always check the full verdict for your exact setup in the calculator.

Sources