Splendid Rainbowfish - Melanotaenia splendida

One notable example is Melanotaenia splendida, commonly known as the Splendid Rainbowfish, which is found in various river systems in northern Australia, including some that may include the Coen River or nearby waters.

The Eastern Rainbowfish, scientifically known as Melanotaenia splendida , is a stunning freshwater fish native to Deepwater Creek in Queensland, Australia. Its iridescent body, shimmering with green, blue, and yellow hues, creates a dazzling display in community aquariums.

Moreover, this peaceful schooling fish thrives in groups, making it an ideal choice for aquarists seeking a vibrant, active addition. Sourcing from captive-bred stocks is recommended to support conservation efforts.

Caring

A tank of at least 100 litres suits the Eastern Rainbowfish, featuring a fine gravel or sandy substrate, driftwood, and dense plants like Vallisneria or Java moss to mimic its natural riverine habitat. For instance, maintain water conditions with a pH of 6.5–8.0, a temperature of 24–30°C, and moderately hard water.

Additionally, moderate lighting and a secure tank lid are essential, as these active swimmers may jump. Weekly 25–30% water changes and a moderate-flow filter ensure pristine water quality.

Ideal Tank Mates

This species flourishes in groups of six or more, showcasing vibrant colours and confident schooling behaviour. They pair well with peaceful fish like neon tetras, Corydoras catfish, or guppies. However, avoid aggressive or fin-nipping species, such as large cichlids, to prevent stress.

Furthermore, a spacious, planted tank with open swimming areas supports their active nature and enhances their display.

Feeding

As omnivores, the Eastern Rainbowfish thrives on a varied diet to enhance its vivid colouration. For example, offer high-quality flakes or small pellets as a staple, supplemented with live or frozen foods like brine shrimp, daphnia, or bloodworms.

Moreover, include plant-based foods such as spirulina flakes or blanched vegetables to ensure balanced nutrition. Feed small portions 2–3 times daily to avoid overfeeding and maintain tank cleanliness.

Quick FACTS

The Eastern Rainbowfish is a vibrant, hardy fish that elevates community aquariums with its iridescent hues and active schooling behaviour. Additionally, its adaptability and ease of care make it suitable for aquarists of all levels. Sourcing from reputable breeders supports conservation for this widespread but locally variable species.

• Species: Melanotaenia splendida
• Common Name: Eastern Rainbowfish
• Origin: Deepwater Creek, Queensland, Australia
• Diet: Omnivorous
• pH Range: 6.5–8.0
• Temperature: 24–30°C
• Current Size: Approximately 4–5 cm
• Max Size: Approximately 8–10 cm
• Tank Size: Minimum 100 litres
• Sex: Unsexed