The harlequin rasbora, also known as Trigonostigma heteromorpha, is a popular freshwater aquarium fish that originates from Southeast Asia. These small, peaceful fish are prized for their attractive appearance, ease of care, and compatibility with other peaceful species.
Appearance
The harlequin rasbora is a small fish, usually growing up to 2 inches in length. Their bodies are elongated and slender, with a triangular shape and a slightly arched back. The base color of their body is silver, with a black patch on their rear half and a bright red or orange patch on their front half. These two patches are separated by a shimmering blue-green line, which gives the fish a distinct harlequin-like appearance.
Habitat
In the wild, harlequin rasboras are found in slow-moving rivers and streams in Southeast Asia, including Thailand, Malaysia, and Sumatra. They prefer to live in densely planted areas with plenty of hiding places and shaded areas. The water in their natural habitat is usually soft and acidic, with a pH range between 5.0 and 7.0.
Tank requirements
Harlequin rasboras are a hardy and adaptable species, making them a popular choice for both beginner and experienced aquarium hobbyists. They require a tank of at least 10 gallons in size, with a pH range between 6.0 and 7.5 and a temperature range between 72°F and 80°F. It’s important to provide plenty of hiding places and plants in the tank, as well as a gentle water flow and a sandy substrate.
Behavior
Harlequin rasboras are a peaceful and social species, and they are usually kept in groups of at least 6-8 individuals. They are active swimmers and love to explore their environment, but they also appreciate plenty of hiding places and shaded areas. Harlequin rasboras are compatible with other peaceful species, including small tetras, guppies, and corydoras catfish.
Diet
Harlequin rasboras are omnivores and will eat a variety of foods, including flake food, pellets, frozen or live foods, and vegetable matter. It’s important to provide a varied diet to ensure they receive all the necessary nutrients. Harlequin rasboras are also known to appreciate the occasional treat of live or frozen brine shrimp or bloodworms.
Breeding
Harlequin rasboras are relatively easy to breed in captivity. The breeding tank should be heavily planted with fine-leaved plants, and the water should be soft and acidic. The males will chase the females around the tank, and the females will lay their eggs among the plants. After the eggs are laid, the adults should be removed from the tank, as they may eat the eggs. The eggs will hatch within 24-48 hours, and the fry should be fed small amounts of live food, such as baby brine shrimp or microworms.
In conclusion, the harlequin rasbora is a popular and attractive species that is suitable for beginner and experienced aquarium hobbyists alike. With their peaceful nature, social behavior, and ease of care, they are a great addition to any community aquarium.
