Boesemani Rainbow XL, scientifically known as Melanotaenia boesemani, is one of the most iconic rainbowfish species, famous for its striking two-tone coloration—a metallic blue or bluish-purple front half that gradually transitions into a bright orange or yellow rear. This gradient effect becomes more vivid as the fish matures and is especially enhanced under good lighting.

The “XL” size refers to larger, mature specimens that display fuller bodies and more intense coloration. Males are typically more vibrant than females, with deeper colors and taller bodies, while females appear slightly smaller with more subdued tones.

Native to Papua (Indonesia), Boesemani Rainbowfish are active schooling fish that thrive in clean, well-oxygenated water and spacious aquariums. Their constant movement and brilliant colors make them a centerpiece species in planted and community tanks.

Key Features

• Species: Melanotaenia boesemani

• Distinct blue-to-orange gradient coloration

• “XL” size – large, mature, highly colored individuals

• Peaceful schooling fish

• Ideal for large planted aquariums

Size

• Adult size: 10 – 12 cm

• XL specimens are typically near full-grown

• Males are larger and more colorful than females

Temperament

Boesemani Rainbow XL is peaceful but very active.

• Best kept in groups of 6 or more

• Active mid to upper water swimmer

• Males may display dominance behavior

• Generally community-friendly

Water Conditions

Requires stable, clean water.

• Temperature: 24 – 28°C (75 – 82°F)

• pH: 7.0 – 8.0

• GH: 8 – 20 dGH

• Ammonia/Nitrite: 0 ppm

• Nitrate: < 20 ppm

Perform regular weekly water changes (20–30%).

Tank Setup

Best suited for spacious, well-maintained aquariums.

Recommended setup includes:

• Open swimming space (very important)

• Planted areas along sides and back

• Driftwood and natural décor

• Moderate to strong lighting (enhances coloration)

• Moderate water flow

Minimum tank size: 150 liters (~40 gallons) or larger.

Feeding Habits

Omnivorous with a strong appetite.

Diet can include:

• High-quality flakes or pellets

• Frozen foods (brine shrimp, daphnia, bloodworms)

• Live foods for color enhancement

• Occasional vegetable matter

Feed 1–2 times daily.

Tank Mates

Suitable for peaceful community setups.

Suitable tank mates:

• Tetras

• Rasboras

• Corydoras

• Larger peaceful fish

• Other rainbowfish species

Tank mates to avoid:

• Aggressive or territorial fish

• Fin-nippers

• Very small, fragile species

Care and Maintenance

To keep Boesemani Rainbow XL healthy:

• Maintain high water quality

• Provide large swimming space

• Keep in groups for natural behavior

• Feed a varied, protein-rich diet

• Perform consistent water changes

With proper care, they can live 5–8 years.

Why Choose Boesemani Rainbow XL?

• Stunning two-tone blue and orange coloration

• Large, eye-catching centerpiece fish

• Active schooling behavior

• Peaceful and community compatible

• Excellent for planted display tanks

Boesemani Rainbow XL is a show-stopping species that brings bold color contrast, dynamic movement, and natural elegance to any aquarium. 🐟💙🧡🌿