Corona Rainbowfish
Melanotaenia corona
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.
Corona Rainbowfish Water Parameters
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.
Who Corona Rainbowfish Is Actually For
Corona Rainbowfish is best for a fishkeeper who wants a species that can settle into a calmer community setup and can provide a keeper who can commit to a proper group of at least 6. It makes the most sense for a hobbyist who will actually build around its needs, especially plants.
The most common mistake is buying Corona Rainbowfish for looks first and only later discovering how its adult size, behavior, or bioload changes the whole tank plan. Another frequent problem is underestimating its social needs. A token pair or trio often behaves very differently from a real group.
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
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.
Useful setup supplies
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Guidarium Editorial Desk
Reviewed against Guidarium care, stocking, and compatibility standards. Read the editorial policy.
- Last reviewed
- May 4, 2026
- Last updated
- May 4, 2026
- Issues or corrections?
- Contact the editorial team
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.
Trapdoor Snail
Cipangopaludina chinensis
Ideal Tank MatesReticulated Stingray (Teacup Ray)
Potamotrygon orbignyi
Ideal Tank MatesTandanus Catfish
Tandanus tandanus
Ideal Tank MatesSkunk Cory
Corydoras arcuatus
Ideal Tank MatesSan Juan Cory
Corydoras bilineatus
Ideal Tank MatesPetricola Catfish
Synodontis petricola
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
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Chilatherina sentaniensis
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A rare and highly active schooling fish native to the Grime River system in New Guinea, currently listed as Critically Endangered in the wild. Widely known in the hobby as Dority's Rainbowfish, they are prized for the male's unique zigzag lateral striping. They are peaceful community fish that require spacious, well-oxygenated tanks with plenty of open swimming room.
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Spotted Rainbowfish
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