The Neon Rainbowfish (Melanotaenia praecox) is a small, vibrant freshwater fish known for its iridescent blue body and neon-like sheen. Peaceful and active, it thrives in schools and adds dynamic color to community aquariums.
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The Neon Rainbowfish (Melanotaenia praecox) is a small, vibrant freshwater fish known for its iridescent blue body and neon-like sheen. Peaceful and active, it thrives in schools and adds dynamic color to community aquariums.
Iridescent blue body with a neon-like shine along the lateral line. Transparent fins with slight yellow or reddish tints in males. Laterally compressed body, forked tail. Males are slightly larger and more colorful; females are smaller and less vivid.
4–6 years with proper care
Omnivorous; feeds on high-quality flakes, pellets, and frozen foods. Supplement with live foods such as brine shrimp, daphnia, and bloodworms. Occasional blanched vegetables are beneficial for balanced nutrition.
Neon Rainbowfish are perfect for aquarists seeking peaceful, schooling, and colorful fish. Their shimmering blue body and active swimming make them a lively addition to community tanks.
Beginner to Intermediate – requires stable water, schooling, and proper nutrition.
20+ gallons (for small school)
7.0 to 8.0
8–15 dGH
75–82°F (24–28°C)
2 inches
Tetras, rasboras, danios, peaceful barbs, other rainbowfish, small peaceful gouramis.
Aggressive or fin-nipping species, larger predatory fish, or very slow-moving delicate fish.
Melanotaenia praecox
Melanotaeniidae
West Papua, Indonesia – shallow rivers and streams.
Highly social; best kept in schools of 6 or more. Peaceful and compatible with other small to medium community fish.
Feed 2–3 times daily with flakes, pellets, and frozen/live foods. Supplement occasionally with blanched vegetables for optimal health and coloration.
Egg-scatterer; deposits eggs among fine-leaved plants or breeding mops. Adults do not guard eggs. Condition male and female with protein-rich diet before breeding. Fry feed on infusoria or newly hatched brine shrimp.
pH: 7.0–8.0, Temperature: 75–82°F (24–28°C), Hardness: 8–15 dGH, Ammonia/Nitrite: 0 ppm, Nitrate: <20 ppm
Sensitive to poor water quality. Prone to stress, ich, and bacterial infections. Maintain regular water changes and a balanced diet.
Peaceful, active, and schooling fish. Best kept in groups of at least 6 to display natural behavior and coloration. Compatible with other peaceful community fish of similar size.
Native to West Papua, Indonesia, Neon Rainbowfish inhabit shallow, slow-flowing rivers and streams. Adults grow up to 2 inches, making them ideal for small to medium-sized community tanks. They require at least 20 gallons for a small school with open swimming space and moderate plants. Providing high-quality food, stable water conditions, and schooling environment ensures active, healthy, and vibrantly colored fish.