Description
Melanotaenia sahulensis
Melanotaenia sahulensis is a stunning freshwater rainbowfish species native to northern Australia and southern New Guinea, where it inhabits clear streams, lagoons, and floodplain waterways. Known for its iridescent body and calm temperament, this species is a perfect representation of the beauty found within the Melanotaenia genus. Its vivid blue-green sheen, active nature, and strong schooling instinct make it a captivating centrepiece for planted freshwater aquariums.
Features of Melanotaenia sahulensis
• Displays a brilliant combination of metallic blue, turquoise, and golden tones
• Males show deeper colouration, elongated fins, and a more pronounced body depth
• Reaches an adult length of around 10–12 cm
• Active, shoaling species that should be kept in groups of six or more
• Peaceful disposition, ideal for planted community tanks
• Prefers clean, well-oxygenated water with moderate flow
The Best Aquarium Size for Melanotaenia sahulensis
A minimum aquarium size of 150 litres is suitable for a small group, though a larger setup of 200 litres or more provides ample swimming space and greater stability. A rectangular aquarium with a length of at least 90 cm is ideal to accommodate their fast, coordinated swimming patterns and territorial displays among males.
Tank Mate Compatibility for Melanotaenia sahulensis
This species is peaceful and thrives in community aquariums with other calm, similar-sized fish. Excellent companions include:
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Boesemani Rainbowfish
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Dwarf Neon Rainbowfish
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Panda Corydoras
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Bristlenose Catfish
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Threadfin Rainbowfish
Diet for Melanotaenia sahulensis
In its natural environment, M. sahulensis feeds on small insects, algae, and planktonic organisms. In captivity, it accepts high-quality flake and pellet foods, supplemented with live or frozen options such as bloodworms, brine shrimp, and daphnia. Including vegetable-based foods or spirulina helps maintain health and enhance colour vibrancy. Feeding small portions twice daily is preferable to maintain energy levels and prevent water quality issues.
Aquarium Setup Melanotaenia sahulensis
Aquarium Filtration
Provide efficient mechanical and biological filtration to ensure crystal-clear, oxygen-rich water. A gentle to moderate flow mimics natural stream conditions and supports their active swimming behaviour.
Aquarium Plants
Plant densely with species like Vallisneria, Hygrophila, or Java Fern to create natural shelter while leaving open spaces for schooling. Floating plants can diffuse light and provide visual comfort.
Aquarium Lighting
Use bright, full-spectrum lighting to enhance the reflective colouration typical of rainbowfish and to support healthy plant growth. Maintain a regular photoperiod of 8–10 hours daily.
Aquarium Heating
Maintain a consistent temperature range of 24–28°C. Stability is key, as rapid fluctuations can stress the fish and dull their colouration.
Aquarium Substrate
A substrate of fine gravel or sand closely resembles their natural habitat and highlights their colours under aquarium lighting.
Aquarium Decorations
Use driftwood, smooth rocks, and natural plants to replicate stream environments. Keep central areas open for swimming and social interaction, ensuring the fish can display their full range of movement and behaviour.
