
Killifish, Rainbowfish, and Medaka
Black Rainbow
Melanotaenia nigrans
Photo: opencage · CC BY 2.5 · Wikimedia Commons
Key facts
- Temperature20–26 °C
- pH5.5–7.5
- Minimum tank100 l
- Adult size8 cm
- Difficulty★★☆☆☆
- Lives in a groupof 6 or more
- TemperamentPeaceful
- WaterFresh
Full profile
- Family
- Melanotaeniidae
- Origin
- Northern Australia
- Size
- 8 cm
- Temperature
- 20 – 26°C
- pH
- 5.5 – 7.5
- GH
- 2 – 12 °dGH
- Difficulty
- ★★☆☆☆
- Water type
- tropical freshwater
- Swimming level
- medium – high
- Behavior
- Pacific
- Minimum number of individuals
- 6
- Minimum aquarium size
- 100 L
- Diet
- omnivore
- Reproduction
- oviparous
Notes: Dark lateral line and fins with red edges. The first rainbowfish to be scientifically described.





