Red-Striped Splendid Rainbow (Melanotaenia splendida rubrostria) — 4-6cm

Overview

The Red-Striped Splendid Rainbow (Melanotaenia splendida rubrostria) is a hardy, brilliantly colored Australian rainbowfish that brings constant movement and vivid red striping to peaceful community aquariums. Native to Northern Australia, especially freshwater streams, rivers, and lagoons in Queensland and nearby tropical regions, this subspecies of the splendid rainbow reaches 4 cm in length and is prized for its stunning horizontal red stripes, iridescent blue-green body coloration, and lively schooling behavior. Males in breeding condition display some of the most intense colors in the rainbowfish family, with vivid red striping that intensifies under good lighting and nutrition. Available for sale UK from specialist suppliers, this species is ideal for aquarists seeking a colorful, active, and easy-to-keep Australian rainbowfish for planted community tanks.

Appearance and Physical Characteristics

Melanotaenia splendida rubrostria exhibits a streamlined, deep-bodied shape with two distinct dorsal fins and a deeply forked caudal fin. Males in breeding condition display a base color of iridescent blue-green to turquoise, overlaid with striking horizontal red to orange-red stripes running from the operculum to the base of the tail, giving the subspecies its common name. The scales have a beautiful metallic sheen. The fins show red, orange, and yellow highlights, especially in the dorsal and anal fins. Females are plainer, with more subdued olive-silver coloration and less pronounced striping. Males are typically more deep-bodied and display more pronounced finnage. Both sexes have large eyes. Color intensity varies with diet, water quality, and breeding condition—males in peak condition are absolutely stunning.

Natural Habitat and Distribution

Melanotaenia splendida rubrostria is native to Northern Australia, especially freshwater streams, rivers, and lagoons in Queensland and nearby tropical regions. They inhabit clear to slightly turbid waters with moderate flow, typically in areas with submerged vegetation, rocks, fallen branches, and overhanging grasses. The substrate is usually sandy or rocky, and water chemistry ranges from slightly acidic to neutral (pH 6.5-7.4). Temperatures are warm year-round (24-28°C). These fish are found in loose schools in midwater zones, foraging for insects, insect larvae, algae, and small invertebrates. Understanding these natural conditions helps replicate appropriate aquarium environments.

Aquarium Setup and Environment

A minimum aquarium capacity of 75 liters is recommended for a school of 8-10 Red-Striped Splendid Rainbows, with larger tanks (100+ liters) preferred for community setups. The tank should emphasize horizontal swimming space with a length of at least 80 cm, as rainbowfish are active swimmers. Provide moderate to dense planting with species such as Vallisneria, Cryptocoryne, Hygrophila, and Anubias, leaving open swimming areas in the center and foreground. A dark substrate enhances the visibility of their vivid red striping and iridescent coloration. Include driftwood, smooth rocks, and some floating plants to diffuse bright lighting and provide subdued areas where males can display. Filtration should be good to excellent, with moderate to strong water movement and high oxygenation to replicate their native flowing waters. A secure lid is recommended, as rainbowfish can jump when startled or during displays.

Water Parameters and Quality

Red-Striped Splendid Rainbows thrive in clean, well-oxygenated water with stable parameters. Maintain temperatures between 24-28°C, with 26°C being optimal. The pH should be slightly acidic to neutral, ranging from 6.5-7.4, though pH 6.8-7.2 is ideal. Water hardness can vary from soft (5 dGH) to moderately hard (12 dGH), providing some flexibility. Stability is more important than exact values—avoid sudden fluctuations in temperature or chemistry. Maintain zero ammonia and nitrite at all times, and keep nitrates below 30 ppm through regular weekly water changes (25-30%). Good oxygenation is essential; ensure strong surface agitation and consider supplemental aeration if stocking levels are high or temperatures rise. Pristine water quality brings out the best coloration and health.

Feeding and Nutrition

Melanotaenia splendida rubrostria is an omnivore with a diet centered on insects, algae, and organic matter. Offer high-quality flakes or pellets as the staple, supplemented daily with frozen and live foods such as daphnia, brine shrimp, bloodworms, and insect larvae. Include regular vegetable matter or spirulina-based foods to replicate natural foraging behavior and enhance red coloration. Feed twice daily in portions that can be consumed within 2-3 minutes, removing uneaten food promptly to maintain water quality. Provide variety to ensure complete nutrition and vibrant coloration. Color-enhancing foods containing carotenoids and astaxanthin will intensify the red striping in males. Fasting one day per week supports digestive health.

Behaviour and Temperament

The Red-Striped Splendid Rainbow is a peaceful, highly active species that thrives in groups and spends most of its time actively schooling and foraging at all levels of the aquarium. They are genuinely peaceful and rarely bother tankmates, making them ideal for community setups. These fish are most confident and display their best coloration when kept in proper schools of 8-10 or more individuals, with a ratio of 2-3 females per male to reduce male-on-male aggression and distribute breeding displays. They are diurnal and most active during daylight hours, constantly on the move exploring and interacting with one another. Males engage in elaborate courtship displays, spreading fins and intensifying color to attract females. Their lively swimming patterns and brilliant red striping make them an engaging and visually stunning addition to planted community aquariums.

Tank Mates and Compatibility

Suitable tank mates for the Red-Striped Splendid Rainbow include other peaceful rainbowfish (especially other Melanotaenia species), danios, rasboras, peaceful barbs (cherry barbs, rosy barbs), Corydoras catfish, and peaceful loaches. These rainbowfish are non-aggressive and coexist peacefully with most community species. Avoid housing with large aggressive cichlids, fin-nipping fish, highly territorial species, very small fry or nano fish that may be eaten, and slow long-finned fish that may be stressed by active tankmates. Shrimp and snails generally coexist peacefully, though very small shrimp or fry may be eaten opportunistically. Providing ample swimming space and avoiding overcrowding reduces stress and promotes peaceful coexistence.

Breeding

Melanotaenia splendida rubrostria can be bred successfully in captivity with proper preparation. Spawning usually occurs among fine-leaved plants or spawning mops. Condition breeding pairs or groups with high-quality live and frozen foods (daphnia, brine shrimp, bloodworms) for 2-3 weeks, selecting the most colorful males and fullest females. Males will display to females with spread fins and intensified coloration. Provide a dedicated breeding tank (60-80 liters) with soft to moderately hard water (pH 6.8-7.2, temperature 26-27°C), gentle to moderate filtration, and moderate lighting. Include fine-leaved plants (Java moss, Myriophyllum) or spawning mops as egg deposition sites. Pairs or groups will spawn over several days, depositing eggs among the plants. Adults may eat eggs, so remove the eggs or breeding pair/group after spawning. Eggs typically hatch in 6-10 days depending on temperature. Fry do best on infusoria and newly hatched brine shrimp initially, progressing to finely crushed flakes as they grow. Provide frequent small feedings (4-5 times daily) and regular small water changes to support healthy growth.

Why Buy from Tropical Fish Co

Tropical Fish Co is the UK's premier destination for healthy, vibrant Red-Striped Splendid Rainbows, carefully selected for color intensity, stripe definition, and genetic quality. Every fish is quarantined upon arrival, conditioned on a varied, high-quality diet including color-enhancing foods, and health-checked before dispatch to ensure you receive robust, disease-free specimens ready to thrive in your aquarium. Our expert team provides comprehensive care guides, personalized stocking advice, and ongoing support to help you create the ideal well-filtered, oxygen-rich environment for these stunning Australian rainbowfish. We offer a live arrival guarantee on all orders, backed by secure, insulated packaging and next-day courier delivery to your door. Whether you're building a peaceful community tank or a dedicated Australian biotope, our commitment to quality, ethical sourcing, and customer service ensures you receive the finest livestock available. Order your Red-Striped Splendid Rainbows today and enjoy the breathtaking beauty and constant activity of one of Australia's most spectacular aquarium species.