Harlequin Rasbora Care Guide and Species Overview

The Harlequin Rasbora is one of the most popular freshwater schooling fish due to its peaceful nature, striking coloration, and ease of care. Its distinctive black triangular marking and copper orange body make it a standout in community aquariums.

Origin and Background

Harlequin Rasboras originate from Southeast Asia, particularly Thailand, Malaysia, and Singapore. They inhabit slow moving forest streams and peat swamps with soft, acidic water and heavy vegetation.

Appearance and Size

Adult Harlequin Rasboras typically reach a size of about 1.75 to 2 inches. Their bodies display a warm copper or orange hue with a bold black wedge shaped marking extending from the mid body toward the tail. Males are usually slimmer and more brightly colored, while females have fuller bodies.

Temperament and Behavior

This species is peaceful, active, and social. Harlequin Rasboras are schooling fish and should be kept in groups of six or more. In proper groups, they exhibit confident swimming behavior and remain tightly coordinated, especially in planted tanks.

Tank Setup and Water Parameters

A minimum tank size of 20 gallons is recommended for a school. A planted aquarium with subdued lighting and darker substrate helps mimic their natural environment and enhances coloration.

Ideal water temperature ranges from 72 to 80 degrees Fahrenheit. The preferred pH range is 6.0 to 7.5 with soft to moderate water hardness. Stable water conditions and regular maintenance are important for long term health.

Diet and Feeding

Harlequin Rasboras are omnivores and accept most high quality flake and micro pellet foods. Their diet should be supplemented with frozen or live foods such as brine shrimp, daphnia, and bloodworms to maintain optimal health and color.

Tank Mates

They are compatible with other peaceful community fish such as tetras, Corydoras, small barbs, gouramis, and dwarf shrimp. Avoid aggressive or significantly larger fish that may intimidate them.

Why Choose Harlequin Rasbora

Harlequin Rasboras are an excellent choice for both beginner and experienced aquarists. Their hardiness, peaceful temperament, and beautiful schooling behavior make them a reliable and visually appealing addition to freshwater aquariums.

Conclusion

With proper care, stable water parameters, and an appropriate group size, Harlequin Rasboras will thrive and provide constant movement and color in a community aquarium.