A living sunset split down the middle — steel blue at the head fading to blazing orange at the tail. Active, peaceful schoolers that shimmer under bright light.
Temperament
Common health issues
- Ich (white spot)
- Fin rot
- Skin conditions
- Swim bladder disorder
Care at a glance
- ExerciseHigh
A busy, energetic swimmer — keep plenty of open swimming room.
- GroomingEasy tank upkeep
No grooming here — steady water quality and routine tank care do it.
- Living spaceNano-tank friendly
Happy in a small, stable, well-filtered tank.
- Owner experienceFor experienced owners
Rewards owners who know the ropes.
- Commitment5–8 years
Plan for a long, loving relationship.
Health to watch: Ich (white spot) · Fin rot · Skin conditions
📖 Care guide
The boesemani rainbowfish (Melanotaenia boesemani) is native to the Ayamaru Lakes region of the Bird's Head Peninsula in West Papua, Indonesia, where it is now endangered in the wild. It grows to about 10–11 cm and lives 5–8 years. Mature males show a striking two-tone body, steel-blue at the front grading to fiery orange at the rear. Boesemani are active, schooling fish that need a tank of 200 litres or more with plenty of length, kept in a group of six or more. Coming from hard, alkaline lakes, they thrive at 25–30°C with a pH of 7.0–8.0. Provide open swimming space with plants along the back and sides, and bright lighting to bring out their full colour, which develops fully only in adults. They are omnivores that eat flake, pellets, and frozen or live foods with gusto. Peaceful and lively, they suit spacious community tanks with other active, robust species, though males display and 'spar' harmlessly for dominance. Hardy overall, their main risks are ich and fin rot from poor water; a large, well-filtered tank with stable, hard water keeps them shimmering and healthy.
Frequently asked questions
How active is a Boesemani Rainbowfish?
High. A busy, energetic swimmer — keep plenty of open swimming room.
How much maintenance does a Boesemani Rainbowfish need?
Easy tank upkeep. No grooming here — steady water quality and routine tank care do it.
What tank size does a Boesemani Rainbowfish need?
Nano-tank friendly. Happy in a small, stable, well-filtered tank.
Is a Boesemani Rainbowfish a good fit for first-time owners?
For experienced owners. Rewards owners who know the ropes.
How long do Boesemani Rainbowfish live?
5–8 years. Plan for a long, loving relationship.
What health issues affect the Boesemani Rainbowfish?
Keep an eye out for Ich (white spot), Fin rot, Skin conditions. These are worth raising with your vet, along with any screening they recommend.
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