Harlequin Rasbora

Harlequin Rasbora main image Harlequin Rasbora image

Harlequin Rasbora

Natural Habitat

The Harlequin Rasbora can be found in the Southeast Asian region in places such as Malaysia, Singapore, Thailand, and Sumatra. The Harlequin Rasbora can be found in streams with low mineral content and pH.

Maximum Size and Longevity

The average size of a Harlequin Rasbora is between 4 – 5cm. If tank is well maintained and fish are healthy, they can live between 5-8 years.

Water Quality

Soft acid water is preferred by the Harlequin Rasbora, and they thrive with the addition of peat water or black water concentrate.

Temperature: 23 - 26 degrees celsius

pH: 6.0—7.5

General Hardness: up to 150 ppm


Harlequin Rasboras are omnivorous and enjoy a variety of foods including dry, live, and frozen. Communal food is not a problem for them.


Harlequin Rasboras are an exceptional addition to your tank and are known as one of the most peaceful aquarium fish. This fish thrives well in a school, and it is recommended to have six or more for best display. These fish like planted aquariums with lots of open spaces to swim.


It is difficult to distinguish male or female in this fish, a small indicator of sex is that the male is slenderer. As this fish requires soft and acidic water to breed it can be quite a challenge. The eggs produced are adhesive and will grip to plants around the tank.

Colour and Varieties

The Harlequin Rasbora has a distinguishable black triangular wedge that goes from the lateral line to the caudal peduncle then to the stomach. This is offset by its base colour of red.




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