The Maccullochi Rainbow fish (Melanotaenia maccullochi) is one of the smallest and most charming Rainbowfish species. Known for their shimmering silver bodies with hints of yellow, blue, or green and their lively schooling behavior, Maccullochi rainbow fish are ideal for aquarists looking for a peaceful, active, and community-friendly species. Perfect for planted aquariums, this rainbow fish adds constant movement and sparkle to freshwater tanks. Originating from northern Australia and New Guinea, the Melanotaenia maccullochi is a hardy and adaptable fish well-suited for community aquariums. Despite their small size, they showcase the same vibrant personality and schooling behavior as larger rainbowfish species. With their peaceful nature and manageable care requirements, they are perfect for aquarists who want the beauty of rainbowfish in smaller aquarium setups. The Maccullochi rainbowfish size averages 2–2.5 inches (5–6 cm), making them one of the smallest rainbowfish available in the hobby. They feature slender, streamlined bodies with subtle iridescent scales that shimmer under aquarium lighting. Color variations may include yellow fins, bluish hues, or faint vertical banding, depending on locality and breeding. Their small size and vibrant shine make them a great addition to nano and planted aquariums. Maccullochi rainbowfish are peaceful schooling fish that thrive in groups of six or more. Their active swimming and non-aggressive temperament make them excellent companions for other small community fish, including Tetras, Rasboras, Corydoras catfish, and Livebearers. They do especially well in planted aquariums with open swimming spaces where their shimmering colors can be fully appreciated. At Splashy Fish tropical fish store, our Maccullochi Rainbowfish for sale are raised with the utmost care. All our Rainbowfish for sale are tank-bred and acclimated for home aquariums, ensuring robust health and vibrant colors. Visit our fish store online or in person at aquarium in Virginia to explore our wide selection of high-quality freshwater fish for sale. We also offer betta fish for sale, freshwater shrimp for sale, aquarium plants for sale, and a variety of aquarium supplies. What You Can Expect From This Fish One of the smallest rainbowfish species at only 2–2.5 inches Peaceful and perfect for community aquariums Hardy, beginner-friendly, and adaptable to a wide range of conditions Shimmering iridescence adds beauty and activity to tanks Ideal for planted aquariums and nano setups Recommended Tank Parameters Tank Size: Minimum 15 gallons for a small group Temperature: 72°–78°F (22°–26°C) pH: 6.5–7.5 Hardness: 5–15 dGH Filtration: Moderate with clean, well-oxygenated water Care Guidelines Diet: Omnivorous. Feed high-quality micro pellets, flakes, and supplements with live or frozen foods such as daphnia, brine shrimp, and mosquito larvae for optimal coloration. Tank Setup: Best in planted tanks with open swimming areas. Add driftwood, plants, and smooth rocks for a natural feel. Behavior: Active, peaceful, and thrives in groups. Displays best colors when kept in schools of six or more. See more detailed information on How to Care for Rainbowfish here.
