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The Lake Kutubu Rainbowfish is a beautiful fish with an playful personality. This fish is found only in Lake Kutubu, a limestone filled lake in southern Papua New Guinea. They are one of the larger rainbow fish, reaching up to 12cm, and are an array of blue hues and fading to a yellowish hue at the bottom . They are active swimmers and enjoy a spacious planted aquarium. Best kept in groups of 6 or more with multiple females to one male.

Features of the Lake Kutubu Rainbowfish:

  • Tolerates slightly alkaline water.
  • Peaceful community fish with appropriate male to female ratio.
  • Stunning array of blue hues that change with mood.
  • Larger species growing up to 12cm with large eyes.
  • Active and spritely swimmers


Tank Mate Compatibility:

Lake Kutubu Rainbowfish are relatively peaceful community fish that prefer to swim in groups of 6 or more. It is best to keep multiple females per male. They can also be kept with other peaceful community fish.

Here’s a list of some of the best tank mates for your Lake Kutubu Rainbowfish.



Lake Kutubu Rainbowfish are omnivores and will eat flake, small pellets, live, fresh, frozen, and freeze-dried. For optimal health, provide a variety of foods, which can include high-quality flake foods, brine shrimp, and any type of worms, as well as vegetable supplements and spirulina. 

Lake Kutubu Rainbow fish have small throats, ensure food particles are not too large.




Lake Kutubu Rainbowfish are best suited to a longer aquarium as they are active and energetic swimmers. An aquarium 3ft or larger is recommended. They are also well known jumpers, thus their aquarium should be well covered. 

After an Aquarium for your fish? Browse our aquariums available here.


Lake Kutubu Rainbowfish prefer water temperatures between 22  ⁰C - 26  ⁰C.

Looking for an aquarium heater? View available aquarium heaters here.


Lake Kutubu Rainbowfish are found in darker waters of Lake Kutubu located in Papua New Guinea. They are happiest in a dimly lit environment. We recommend LED aquarium lighting with adjustable brightness to ensure the light level can be altered for happy fish. 

Need aquarium lighting? View available aquarium lighting here.


Lake Kutubu Rainbowfish will tolerate wide parameters and slightly alkaline water however enjoy good water quality and stable conditions. Ensure adequate filtration in your aquarium.

Explore aquarium filtration products here.


Lake Kutubu Rainbowfish enjoy dark substrates that mimic their natural habitat. They show vibrant colours when less stressed in a darker environment.

View our range of aquarium substrates here.


Plants for Rainbowfish:

Lake Kutubu Rainbowfish enjoy spacious yet dense planted aquariums with medium to large plants, including floating plants. Plant out the background with tall growing plants, leaving the foreground an open space for swimming.

Interested in live plants for your aquarium? View our range of live aquarium plants here.


Decorations for Rainbowfish:

Rock & wood can be placed in the aquarium to mimic natural habitats and provide hiding locations to retreat to. 

View our large range of aquarium decorations here.

Additional Information

Fish Keeping Snapshot

Preferred Water Parameters