Skull Creek Rainbow - Melanotaenia sahulensis

Once considered a species of Melanotaenia maccullochi, the Skull Creek Rainbows (Melanotaenia sahulensis) is a smaller Melanotaenia species that exhibits many horizontal stripes throughout the body. They are yellow in colour with black striping. Most Rainbows show their best colors at sunrise, when the males display their bright fins for potential mates. Having more females than males will allow for proper color displays and avoid any unwanted aggression towards lone females.

Caring for Your Fish

To ensure the Sahul Rainbowfish thrives, a tank of at least 80 litres is recommended, featuring a fine gravel or sandy substrate, driftwood, and dense plants like Java moss or Anubias to mimic its natural habitat.

For instance, maintain water conditions with a pH of 6.5–8.0, a temperature of 24–29°C, and moderately hard water. Additionally, moderate lighting and a secure tank lid are crucial, as these active swimmers may leap. Weekly 20–30% water changes and a gentle filter promote pristine water quality.

Ideal Tank Mates for Sahul Rainbowfish

This species excels in groups of six or more, displaying vibrant colours and confident schooling behaviour. They coexist harmoniously with peaceful companions like guppies, ember tetras, or Kuhli loaches. However, avoid aggressive or larger fish, such as cichlids, to prevent stress. Furthermore, a spacious, planted tank with open swimming areas supports their active nature and enhances their display.

Feeding and Nutrition

As omnivores, the Sahul Rainbowfish benefits from a varied diet to maintain 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 spinach to ensure balanced nutrition. Consequently, feed small portions 2–3 times daily to avoid overfeeding and keep the tank clean.

Quick FACTS

The Sahul Rainbowfish is a vibrant, peaceful fish that elevates community aquariums with its iridescent colours and active schooling behaviour. Additionally, its adaptability and striking appearance make it suitable for aquarists of all experience levels. Note that sourcing from reputable breeders supports conservation efforts, as wild populations may face habitat pressures.

• Species: Melanotaenia sahulensis
• Common Name: Sahul Rainbowfish
• Origin: Moa Island, Torres Strait, Australia
• Diet: Omnivorous
• pH Range: 6.5–8.0
• Temperature: 24–29°C
• Current Size: Approximately 4–5 cm
• Max Size: Approximately 7–9 cm
• Tank Size: Minimum 80 litres
• Sex: Unsexed