A deep-bodied fish in shifting turquoise and blue, brightest in the first hour after the lights come on when the males chase each other in colour duels.
Temperament
Common health issues
- Ich (white spot)
- Fin rot
- Skin conditions
- Swim bladder disorder
Care at a glance
- ExerciseHigh
A busy, energetic swimmer โ keep plenty of open swimming room.
- GroomingRoutine tank care
Weekly partial water changes keep them in top shape.
- Living spaceNano-tank friendly
Happy in a small, stable, well-filtered tank.
- Owner experienceFor experienced owners
Rewards owners who know the ropes.
- Commitment5โ8 years
Plan for a long, loving relationship.
Health to watch: Ich (white spot) ยท Fin rot ยท Skin conditions
๐ Care guide
The Turquoise or Lake Kutubu Rainbowfish (Melanotaenia lacustris) is endemic to Lake Kutubu and its outflow in Papua New Guinea, and reaches about 10 to 12 cm. Adults develop a high, laterally compressed body and an intense blue-turquoise that shifts toward green along the back, with the strongest colour shown by dominant males during dawn display. Its restricted natural range makes captive-bred stock the responsible choice. A group of six or more, with several males so display behaviour occurs, needs a tank of 200 litres or more at 22-26C with a pH of 7.0 to 8.0 and medium to hard water; unlike many soft-water tropicals it prefers alkaline conditions. Give it length for swimming, planting at the sides and a secure lid, as rainbowfish jump. Feed quality flake, pellets and frequent frozen or live daphnia, bloodworm and brine shrimp to keep colour strong. It is hardy, peaceful and long-lived, and the honest caveat is simply that juveniles in shops look drab and give no hint of the adult colour.
Frequently asked questions
How active is a Turquoise Rainbowfish?
High. A busy, energetic swimmer โ keep plenty of open swimming room.
How much maintenance does a Turquoise Rainbowfish need?
Routine tank care. Weekly partial water changes keep them in top shape.
What tank size does a Turquoise Rainbowfish need?
Nano-tank friendly. Happy in a small, stable, well-filtered tank.
Is a Turquoise Rainbowfish a good fit for first-time owners?
For experienced owners. Rewards owners who know the ropes.
How long do Turquoise Rainbowfish live?
5โ8 years. Plan for a long, loving relationship.
What health issues affect the Turquoise 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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