Parva Rainbowfish

Melanotaenia parva is among the smallest members of its genus, reaching only about 5 cm in length, and originates from the Kais River drainage in West Papua, Indonesia. Despite its diminutive size, it displays all the typical rainbowfish characteristics — an iridescent body shimmering with blue, green, and yellow highlights, active schooling behaviour, and spirited male display behaviour. The small size makes it an ideal candidate for nano and planted community aquariums.

This species is soft-water adapted compared to most other Melanotaenia and does best in slightly acidic to neutral, soft to moderately hard water. It is sensitive to poor water quality and requires efficient filtration and regular water changes. Planted tanks with fine-leaved plants suit it particularly well, both aesthetically and functionally for spawning.

Melanotaenia parva is rarely available but is prized by rainbowfish specialists for its unusual size and delicate appearance. It spawns readily on fine-leaved plants and spawning mops, depositing small adhesive eggs. Fry are tiny and require infusoria or commercial fry foods before graduating to newly hatched brine shrimp.

Water: pH 6.5–7.5, temperature 23–28°C, soft to moderately hard; sensitive to water quality, change 20–25% weekly. Tank: Minimum 60 L; finely planted; gentle filtration to avoid strong currents overwhelming small fish. Feeding: Fine flake, micro-pellets; small live and frozen foods such as micro-worms and brine shrimp nauplii. Breeding: Spawns on fine plants or mops; fry are tiny; start with infusoria or commercial fry food. Compatibility: Ideal with other nano species; avoid large, boisterous, or predatory tankmates.