Rhomb barb - Puntius rhomboocellatus

Scientific name: Puntius rhomboocellatus

Common name: Rhomb barb

Family: Cyprinidae

Usual size in fish tanks: 5 - 7 cm (1.97 - 2.76 inch)

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Recommended pH range: 6 - 7.2

Recommended water hardness: 2 - 12°N (35.71 - 214.29ppm)

0°C 32°F30°C 86°F

Recommended temperature range: 23 - 28 °C (73.4 - 82.4°F)

The way how these fish reproduce: Spawning

Where the species comes from: Southeast Asia

Temperament to its own species: peaceful

Temperament toward other fish species: peaceful

Usual place in the tank: Middle levels

Food and Feeding

Puntius rhomboocellatus is an omnivorous species that accepts a wide variety of foods. A high-quality flake or small pellet should be used as the staple diet. Supplement with live or frozen foods such as bloodworms, daphnia, brine shrimp, and Cyclops to enhance coloration and overall health.

Occasional vegetable matter such as spirulina-based foods can also be offered. Feed small portions once or twice daily. A varied diet helps maintain strong coloration and activity.

Origin

Puntius rhomboocellatus originates from Southeast Asia, primarily Borneo. They inhabit slow-moving forest streams and peat swamps with soft, slightly acidic water. These habitats often contain leaf litter, submerged roots, and dense vegetation.

Tank Setup and General Care

This species does best in a well-planted aquarium with subdued lighting. Driftwood and plants help recreate their natural habitat. A dark substrate may enhance coloration. Soft to slightly acidic water is preferred, although they are adaptable.

They are active schooling fish and should be kept in groups of at least six individuals. In larger groups, they display more natural behavior and reduced stress.

Temperament and Compatibility

Puntius rhomboocellatus is peaceful and suitable for community aquariums. Ideal tank mates include small tetras, rasboras, peaceful barbs, dwarf cichlids, and other non-aggressive species.

Avoid keeping them with large or aggressive fish that may intimidate them. Keeping them in groups reduces shyness and improves overall behavior.

Sexing

Females tend to have a fuller, rounder body shape, especially when carrying eggs. Males are usually slimmer and may display slightly stronger coloration.

Breeding

Puntius rhomboocellatus is an egg-scattering species. Provide fine-leaved plants or spawning mops for egg deposition. Conditioning the adults with live or frozen foods improves spawning success.

Spawning usually occurs at daybreak. After spawning, the adults should be removed, as they may eat the eggs. The eggs hatch within 24–48 hours. Fry can initially be fed infusoria, followed by newly hatched brine shrimp.

Lifespan

The expected lifespan of Puntius rhomboocellatus is approximately 3 to 5 years. Good water quality, group keeping, and a varied diet contribute to longevity.

Short Description

Puntius rhomboocellatus is a peaceful schooling barb from Borneo. Best kept in planted aquariums with soft water, this species is suitable for community tanks. Their active behavior and subtle patterning make them an attractive addition to Southeast Asian setups.