Spotted Rainbowfish (Glossolepis maculosus) — 3-4cm

Overview

Spotted Rainbowfish (Glossolepis maculosus) is a small, shimmering Papua New Guinea rainbowfish with spotted patterning and lively schooling behavior, ideal for peaceful planted aquariums. Endemic to the river systems of the Markham and Ramu Rivers in Papua New Guinea, this species is prized for its subtle beauty, peaceful nature, and hardy adaptability. Now available for sale UK from Tropical Fish Co, the Spotted Rainbowfish is ideal for the community aquarium keeper seeking a splash of color and constant movement.

Appearance

The Spotted Rainbowfish typically reaches around 7 cm in total length, making it a small to medium-sized rainbowfish. The body is elongated and laterally compressed, with a shimmering silver or pale gold base color marked with distinctive dark spots along the flanks and dorsal region, giving the species its common name. The fins are semi-transparent and may show hints of yellow or red in well-conditioned males. Females are generally more subdued in color. Healthy specimens have bright, clear eyes and smooth, unblemished scales.

Natural Habitat

In the wild, Glossolepis maculosus is endemic to the river systems of the Markham and Ramu Rivers in Papua New Guinea. These waters are typically warm, moderately flowing, and well-oxygenated, with sandy or gravelly substrates and plenty of aquatic vegetation providing cover. The surrounding landscape is forested, providing shade and contributing organic matter to the water. During the wet season, water levels rise and fish move into flooded areas to spawn among submerged vegetation.

Aquarium Setup

A well-filtered aquarium of at least 90 litres is recommended for a shoal of Spotted Rainbowfish, as they are active swimmers and require plenty of open space. Use a fine gravel or sand substrate and incorporate smooth rocks, driftwood, and live plants such as Vallisneria, Java fern, or Anubias to provide cover and visual interest. Ensure good filtration and moderate water movement to maintain high oxygen levels. A secure lid is essential, as active rainbowfish can jump when startled or during courtship displays.

Feeding

The Spotted Rainbowfish is an omnivore and thrives on a varied diet. Offer high-quality flake or micro-pellet foods as a staple, supplemented with frozen or live foods such as daphnia, brine shrimp, and bloodworms. Some vegetable matter, such as blanched spinach or spirulina-based foods, will support digestive health and color. Feed twice daily in small amounts to maintain excellent water quality.

Behaviour

This rainbowfish is lively, active, and social, constantly on the move and best kept in a shoal of at least six individuals. When kept in proper numbers, the Spotted Rainbowfish is peaceful and confident, displaying natural schooling behavior and engaging in playful interactions. Males may engage in courtship displays, spreading their fins and showing off to females, but serious aggression is rare. They occupy the middle and upper levels of the aquarium and are most active during the day.

Tank Mates

The Spotted Rainbowfish is suitable for a peaceful community aquarium with other medium-sized fish. Good tankmates include other peaceful rainbowfish of similar size, peaceful midwater community fish of similar size, Corydoras catfish, and peaceful loaches of appropriate size. Avoid large aggressive cichlids, fin-nipping barbs, large predatory fish, and highly aggressive tankmates.

Breeding

Breeding the Spotted Rainbowfish is achievable with careful preparation. Spawning usually occurs among fine-leaved plants or spawning mops in a separate breeding tank. Condition adults with rich live and frozen foods, and provide clean, stable water. Adults may eat eggs, so remove the eggs or breeding pair after spawning. Fry require very small live foods such as infusoria initially, graduating to baby brine shrimp as they grow.

Why Buy from Tropical Fish Co

Tropical Fish Co is a leading UK aquatics specialist offering beautiful rainbowfish species like the Spotted Rainbowfish direct to your door. Every fish is quarantined, inspected, and dispatched with expert care to ensure it arrives in peak condition. With decades of experience, transparent pricing, and exceptional customer support, we make it easy to add peaceful, attractive species to your collection. Order online today and enjoy fast, reliable delivery across the UK.