Bosmania Rainbow

Overview

The Boesemani Rainbow (Melanotaenia boesemani) is an iconic rainbowfish with a stunning blue-to-orange gradient colouration. Active, peaceful, and one of the most visually impressive freshwater fish. Males display the most vibrant colours.

Water Parameters

• Temperature: 22–28°C (72–82°F)
• pH: 7.0–8.0 (prefer slightly alkaline)
• Hardness: 8–20 dGH (moderately hard)

Tank Setup

• Minimum tank size: 250 litres for 6+
• Decor: Planted with generous open swimming space; they are active swimmers
• Flow: Moderate to strong; they appreciate current

Diet

• Base: Quality flake, granules
• Treats: Frozen bloodworms, brine shrimp, daphnia, blanched vegetables
• Note: Varied diet essential for colour — spirulina-based foods enhance blue

Temperament & Tank Mates

• Temperament: Peaceful, active schooling fish
• Best companions: Other medium-large peaceful fish — larger tetras, gouramis, corydoras, other rainbowfish
• Schooling: Minimum 6; they school loosely

Breeding

• Difficulty: Easy; scatter spawner
• Process: Fine-leaved plants; remove parents

Common Issues

• Need a long aquarium — they are active swimmers
• Colour intensifies in mature, well-maintained tanks
• Not suitable for nano tanks — they grow to 8–11 cm
• Lifespan: 5–8 years