A critically endangered and highly sought-after rainbowfish endemic to the Sermowai River in Northern New Guinea. Originally known from only two preserved specimens collected in 1911 above a waterfall, it has only recently been rediscovered and bred for the aquarium hobby. They feature distinct dark longitudinal stripes and dark fins with striking white margins. Like most rainbowfish, they are fast, active schoolers that require pristine, well-oxygenated water and ample open swimming space.
Corona Rainbowfish At a Glance
Corona Rainbowfish Tank Requirements
Will Corona Rainbowfish fit in your tank?
Care guides tell you what Corona Rainbowfish needs, the next question is whether your tank can safely provide it. Test Corona Rainbowfish against your tank size, maintenance needs, and the fish you already keep before you buy.
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Corona Rainbowfish Water Parameters
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Corona Rainbowfish Temperament & Compatibility
Corona Rainbowfish Varieties
Each variety inherits the species defaults above. Only differences are highlighted.
Male
Males develop a significantly deeper, more robust body profile as they mature. They boast longer dorsal and anal fins and exhibit intense, flashing coloration during morning spawning displays to attract females.
Same care requirements as the base species
Also known as: Standard, Male Corona
Female
Females remain more slender and slightly smaller throughout their lives. Their fin rays are shorter, and their overall coloration is more subdued compared to the vivid males.
Differs in 1 trait from base species
Also known as: Female Corona
Corona Rainbowfish Care Guide Summary
The Corona Rainbowfish, scientifically known as Melanotaenia corona, belongs to the Rainbowfish family group. Adults reach a maximum size of approximately 10 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 Corona Rainbowfish requires a freshwater only aquarium with a minimum volume of 150 litres and a tank length of at least 90 cm. Water temperature should be maintained between 24°C and 28°C, with a pH range of 7–8 and a general hardness of 8–15 dGH. A moderate water flow is preferred.
The Corona Rainbowfish is a rewarding species to keep, provided its core environmental needs are met. This species is available in 2 varieties: 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.
Corona Rainbowfish Habitat Setup
When setting up an aquarium for the Corona 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 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.
Corona Rainbowfish Compatibility Notes
Classified as peaceful, the Corona 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.
Corona Rainbowfish Recommended Tank Sizes
Standard aquarium sizes that meet the minimum volume and length requirements for Corona Rainbowfish.
40 Gallon Breeder
55 Gallon Standard
60 Gallon Breeder
75 Gallon Standard
90 Gallon Standard
125 Gallon Standard
Show 9 more tank sizes
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Frequently Asked Questions About Corona Rainbowfish
How big does Corona Rainbowfish get?
Corona Rainbowfish (Melanotaenia corona) typically reaches a maximum adult size of approximately 10 cm. They have a compressed body shape and a moderate growth rate.
What tank size does Corona Rainbowfish need?
A minimum aquarium volume of 150 litres and a tank length of at least 90 cm are recommended for Corona Rainbowfish. This ensures enough swimming space and helps maintain stable water conditions.
What water parameters does Corona Rainbowfish need?
Corona Rainbowfish thrives in freshwater only conditions with a temperature range of 24–28°C, a pH between 7 and 8, and a general hardness of 8–15 dGH. A moderate water flow is preferred.
Is Corona Rainbowfish peaceful or aggressive?
Corona 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 Corona Rainbowfish should be kept together?
Corona 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 Corona Rainbowfish have any special tank requirements?
Yes. Corona Rainbowfish benefits from plants - densely covered in the aquarium. These features help replicate their natural habitat and promote overall health and well-being.
Does Corona Rainbowfish need a lid on the tank?
Yes. Corona 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 Corona Rainbowfish
These fish are strong compatibility matches for Corona Rainbowfish based on water preferences, temperament, adult size, and tank behavior.
Dainty Cory (Salt and Pepper Cory)
Corydoras habrosus
Ideal Tank MatesZebra Shovelnose (Tigrinus Catfish)
Brachyplatystoma tigrinum
Ideal Tank MatesEmerald Green Cory
Corydoras splendens
Ideal Tank MatesAngelicus Botia
Botia kubotai
Ideal Tank MatesGolden Bristlenose Pleco
Ancistrus sp. L144
Ideal Tank MatesAgassiz Cory
Corydoras agassizii
Ideal Tank MatesPlants That Suit Corona Rainbowfish
These plants pair well with Corona 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 Corona Rainbowfish
Bulolo Rainbowfish
Chilatherina bulolo
A rare and highly active rainbowfish native to the fast-flowing mountain streams and white-water rapids of the Markham and Ramu river systems in Papua New Guinea. They possess a silvery body with a distinct black streak on the upper and lower edges of the caudal fin. Because of their specialized natural habitat, they require highly oxygenated, fast-flowing water and alkaline conditions to thrive in an aquarium.
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.
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.
Cairns Rainbowfish
Cairnsichthys rhombosomoides
The Cairns Rainbowfish is a critically endangered species native to the Wet Tropics of Queensland, Australia. Unlike many rainbowfish, this species inhabits clear, fast-flowing, shaded rainforest creeks with rocky bottoms and virtually no aquatic plants. They are active, peaceful schooling fish that require highly oxygenated water and plenty of horizontal swimming space.
Exquisite Rainbowfish
Melanotaenia exquisita
A highly active, schooling species native to the fast-flowing, clear streams of Australia's Northern Territory. True to their name, they display stunning metallic bodies with bright red-tipped fins. They require pristine, well-oxygenated water, plenty of horizontal swimming space, and should always be kept in groups of 6 or more.
Barred Rainbowfish
Chilatherina fasciata
A robust, active, and highly colorful schooling fish native to the clear, fast-flowing streams of New Guinea. They are named for the distinctive vertical black bars on their lower flanks. As highly active swimmers that do best in hard, alkaline water, they require a spacious, long aquarium (minimum 4 feet) with strong oxygenation and plenty of open swimming space.