Harlequin Rasbora

Harlequin Rasbora (Trigonostigma heteromorpha), sometimes called the harlequin tetra, is a small, active fish known for its vibrant copper orange colouration and distinctive triangular black patch on its body. Our harlequin rasboras for sale grow to around 4 to 5cm, and this peaceful species is a popular choice among aquarium hobbyists, offering both beauty and liveliness to community tanks.

Location

Native to the slow flowing streams and peat swamps of Southeast Asia, particularly Malaysia, Singapore, Sumatra and southern Thailand, the Harlequin Rasbora thrives in warm, soft water. Aquariums that replicate their natural habitat with plenty of plants and open swimming space are ideal for this species.

Diet

Harlequin Rasboras are omnivores and will readily accept a variety of foods. They enjoy high quality flake food, pellets, and live or frozen foods such as brine shrimp and daphnia. A varied diet supports their health and vibrant colour.

Care

This species prefers water temperatures between 24 and 28°C and slightly acidic to neutral pH levels. Keep them in groups of eight or more. Regular water changes and good filtration are important to maintain a healthy environment for the Harlequin Rasbora, as they are sensitive to poor water quality.

Habitat

Harlequin Rasboras do best in well planted aquariums with soft, slightly acidic water. They are peaceful and enjoy swimming in groups, so they should be housed with other peaceful species in a community tank. Providing hiding spots like driftwood and rocks helps them feel secure.

Breeding

Breeding Harlequin Rasboras in captivity is possible with the right care. Unusually for rasboras, they lay their eggs on the underside of broad leaves, such as Cryptocoryne, and the adults should be removed after spawning to prevent the eggs from being eaten. With proper care, breeding can be successful.

Buy more and save, with multi-buy discounts from 5 fish. See also our chilli rasbora and ember tetra, or browse all our danios and rasboras.

Shipping Information

We take care to ensure your order arrives in excellent condition and ready to settle into your aquarium. All orders are shipped with tracking, and the cut-off time for same-day dispatch is 4 pm.

Orders containing dry goods, shrimp, snails or plants are dispatched Monday to Friday via Royal Mail for fast, reliable delivery. Livestock, in particular live fish and invertebrates, are dispatched Monday to Wednesday only, using an approved overnight courier, to avoid weekend delays and ensure safe and timely delivery.

Track Your Order

You will receive a tracking number by email when we begin processing your order for shipping. The selected courier will provide updates on delivery only through their tracking page.

During colder weather, heat packs are added when needed. Livestock orders are carefully packed in insulated boxes to help maintain a stable temperature throughout transit.

View our Shipping Policy