A very rare and Critically Endangered rainbowfish endemic to the swampy Lake Mbuta basin in West Papua, Indonesia. It is the sole member of the genus Pelangia. Characterized by a yellowish-tan body grading to silvery-white, they are peaceful, active schooling fish. They are virtually unseen in the standard aquarium trade.
Lake Mbuta Rainbowfish At a Glance
Lake Mbuta Rainbowfish Tank Requirements
Will Lake Mbuta Rainbowfish fit in your tank?
Care guides tell you what Lake Mbuta Rainbowfish needs, the next question is whether your tank can safely provide it. Test Lake Mbuta Rainbowfish against your tank size, maintenance needs, and the fish you already keep before you buy.
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Lake Mbuta Rainbowfish Water Parameters
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Lake Mbuta Rainbowfish Temperament & Compatibility
Lake Mbuta Rainbowfish Varieties
Each variety inherits the species defaults above. Only differences are highlighted.
Standard / Mixed
A standard mixed-sex shoal. Like most rainbowfish, they require groups of 6 or more to feel secure, establish social hierarchies, and display their best colors.
Differs in 1 trait from base species
Male
Males are slightly larger and deeper-bodied than females. Mature males exhibit scattered yellow flecks along their sides and a distinct dusky grey pigmentation on the first dorsal fin. They will spar harmlessly with other males for dominance.
Differs in 2 traits from base species
Also known as: Male Mbuta
Female
Females are slightly smaller with a shallower body depth. They lack the yellow flecks seen in mature males and are highly peaceful.
Differs in 1 trait from base species
Also known as: Female Mbuta
Lake Mbuta Rainbowfish Care Guide Summary
The Lake Mbuta Rainbowfish, scientifically known as Pelangia mbutaensis, belongs to the Rainbowfish family group. Adults reach a maximum size of approximately 5.5 cm and have a compressed body shape with a moderate growth rate. Classified as peaceful, this species primarily occupies the surface and mid-level zones of the aquarium and produces a low level of biological waste.
To thrive, the Lake Mbuta Rainbowfish requires a freshwater only aquarium with a minimum volume of 75 litres and a tank length of at least 60 cm. Water temperature should be maintained between 24°C and 28°C, with a pH range of 6–7.5 and a general hardness of 4–12 dGH. A moderate water flow is preferred.
The Lake Mbuta Rainbowfish is a rewarding species to keep, provided its core environmental needs are met. This species is available in 3 varieties: Standard / Mixed, Male, and Female. Each may differ slightly in size, temperament, or care needs, so it is worth checking the specific requirements of the variety you plan to keep.
Lake Mbuta Rainbowfish Habitat Setup
When setting up an aquarium for the Lake Mbuta Rainbowfish, a moderate water flow best suits their natural preferences. Because this species occupies the surface and mid-level zones, the aquarium layout should prioritise adequate surface area with floating cover to make them feel secure near the waterline and open swimming space in the centre of the tank for free movement. Useful additions include driftwood, which can serve as both a hiding place and a dietary supplement and dense planting to provide cover, break sightlines, and reduce stress. Keepers should note that a tight-fitting lid is essential, as this species is a known jumper.
Lake Mbuta Rainbowfish Compatibility Notes
Classified as peaceful, the Lake Mbuta Rainbowfish is a schooling species that feels most secure in a sizeable group, where natural shoaling behaviour reduces stress and brings out their best colours. When choosing tankmates, their energetic swimming style may stress more sedentary or timid species. Selecting tankmates that favour different water layers from the surface and mid-level zones can help reduce competition and territorial overlap.
Lake Mbuta Rainbowfish Recommended Tank Sizes
Standard aquarium sizes that meet the minimum volume and length requirements for Lake Mbuta Rainbowfish.
20 Gallon High
20 Gallon Long
29 Gallon Standard
30 Gallon Breeder
36 Gallon Bowfront
40 Gallon Breeder
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Frequently Asked Questions About Lake Mbuta Rainbowfish
How big does Lake Mbuta Rainbowfish get?
Lake Mbuta Rainbowfish (Pelangia mbutaensis) typically reaches a maximum adult size of approximately 5.5 cm. They have a compressed body shape and a moderate growth rate.
What tank size does Lake Mbuta Rainbowfish need?
A minimum aquarium volume of 75 litres and a tank length of at least 60 cm are recommended for Lake Mbuta Rainbowfish. This ensures enough swimming space and helps maintain stable water conditions.
What water parameters does Lake Mbuta Rainbowfish need?
Lake Mbuta Rainbowfish thrives in freshwater only conditions with a temperature range of 24–28°C, a pH between 6 and 7.5, and a general hardness of 4–12 dGH. A moderate water flow is preferred.
Is Lake Mbuta Rainbowfish peaceful or aggressive?
Lake Mbuta Rainbowfish is classified as peaceful with an aggression score of 2 out of 10. They are generally well-suited to peaceful community tanks.
How many Lake Mbuta Rainbowfish should be kept together?
Lake Mbuta Rainbowfish is a schooling species and should be kept in groups of at least 6. Larger groups help distribute aggression and encourage natural schooling behaviour.
Does Lake Mbuta Rainbowfish have any special tank requirements?
Yes. Lake Mbuta Rainbowfish benefits from plants - densely covered and driftwood (digestion/hiding) in the aquarium. These features help replicate their natural habitat and promote overall health and well-being.
Does Lake Mbuta Rainbowfish need a lid on the tank?
Yes. Lake Mbuta Rainbowfish is a known jumper, and a tight-fitting lid or cover is essential to prevent escape. Even a small gap can be enough for a determined fish to leap out.
Top Tank Mates for Lake Mbuta Rainbowfish
These fish are strong compatibility matches for Lake Mbuta Rainbowfish based on water preferences, temperament, adult size, and tank behavior.
Mottled Loach
Paracanthocobitis botia
Ideal Tank MatesSchwartz's Cory
Corydoras schwartzi
Ideal Tank MatesLeopard Cory
Corydoras leopardus
Ideal Tank MatesGold Laser Cory
Corydoras sp. 'CW010'
Ideal Tank MatesDainty Cory (Salt and Pepper Cory)
Corydoras habrosus
Ideal Tank MatesZebra Shovelnose (Tigrinus Catfish)
Brachyplatystoma tigrinum
Ideal Tank MatesPlants That Suit Lake Mbuta Rainbowfish
These plants pair well with Lake Mbuta Rainbowfish based on shared water preferences, layout fit, and how likely they are to hold up in the same aquarium.
Afzel's Anubias
Anubias afzelii
Amazon Sword
Echinodorus amazonicus
Anacharis
Egeria densa
Anubias Barteri
Anubias barteri
Baby Tears
Lindernia rotundifolia
Balansae
Cryptocoryne crispatula
Fish Similar to Lake Mbuta Rainbowfish
Lake Wanam Rainbowfish
Glossolepis wanamensis
A critically endangered species (IUCN Red List) endemic to Lake Wanam in Papua New Guinea. Known for the extreme deep-bodied shape and metallic green-bronze colors that mature males develop. They are fast, active schooling fish that require hard, alkaline water and plenty of swimming space. Excellent for large planted aquariums.
Ajamaru Rainbowfish
Melanotaenia ajamaruensis
A highly active, schooling rainbowfish endemic to the Ayamaru Lakes in West Papua, Indonesia. Currently listed as Critically Endangered in the wild. It is closely related to Boeseman's Rainbowfish but possesses a notably more slender body and more prominent reddish-brown horizontal striping. They thrive in hard, alkaline water with dense vegetation and require significant horizontal swimming space.
Turquoise Rainbowfish
Melanotaenia lacustris
A stunning, deep-bodied rainbowfish endemic to Lake Kutubu in Papua New Guinea. Famous for their ability to shift colors from deep teal to bright iridescent blue depending on mood and water quality. They are active schooling fish that thrive in hard, alkaline water.
Kamaka Rainbowfish
Melanotaenia kamaka
Endemic to the karst Lake Kamakawai in West Papua, this is a spectacular and distinctively deep-bodied rainbowfish. As they mature, males develop a robust chest and an intense silvery-blue to purplish sheen. Like all rainbowfish, they are highly active, schooling fish that require spacious tanks with plenty of horizontal swimming room and alkaline, hard water parameters.
Boeseman's Rainbowfish
Melanotaenia boesemani
An incredibly popular and active schooling fish endemic to the Ajamaru Lakes in West Papua, Indonesia (currently listed as Endangered in the wild by the IUCN due to overfishing and habitat loss, though commercially captive-bred). Famous for the mature male's spectacular blue and orange split-coloration. They require long tanks for active swimming, excellent oxygenation, and warm, hard, alkaline water to thrive.
Highlands Rainbowfish
Chilatherina campsi
A rare and elegant species endemic to the central highlands of Papua New Guinea. Unlike many tropical rainbowfish, it thrives in slightly cooler, well-oxygenated water. They are very active, peaceful schooling fish characterized by an olive/mauve back, silvery reflections, and a distinct blackish-to-blue mid-lateral stripe.