Max Size: 5.5cm

Forktail Blue Eye Rainbowfish (Pseudomugil furcatus)

The Forktail Blue-eye Rainbowfish, Pseudomugil furcatus is a small, hardy, adaptable and peaceful species that is easy to maintain, making them ideal fish for beginner aquarists and the more advanced aquarists. In addition, their colouring is stunning and impressive.

Forktail Blue-eye Rainbowfish make an excellent addition to the nano or planted aquarium, housing other small, peaceful species or even showcased as a single species in a high-quality aquascaped aquarium.

The ideal aquarium setup for these Rainbowfish would contain areas of dense vegetation, including some floating aquatic plants, along with driftwood roots and branches to help diffuse the light. Having a dark background and substrate will also help bring out the colours of these fish.

The Forktail Blue-eye Rainbowfish has a grey to green body colouration with bright yellow edges on all of its fins displaying black margins on the rear dorsal, anal, and caudal fins. When in spawning conditions, the males will also display bright red colouring on their chest area. As juveniles, this intense colouring is non-existent; however, as they reach maturity, the colours will intensify.

Forktail Blue Eye Rainbowfish (Pseudomugil furcatus) Video

Forktail Blue Eye Rainbowfish (Pseudomugil furcatus) Freshwater Aquarium Fish Profile & Care Guide


Forktail Blue-Eye Rainbow Fish
Forktail Blue-Eye Rainbow Fish
Forktail Blue-Eye Rainbow Fish
Forktail Blue-Eye Rainbow Fish
Forktail Blue-Eye Rainbow Fish
Forktail Blue-eye Rainbowfish
Forktail Blue-eye Rainbowfish
Forktail Blue-eye Rainbowfish
Forktail Blue-eye Rainbowfish
Forktail Blue-eye Rainbowfish
Forktail Blue-eye Rainbowfish
Forktail Blue-eye Rainbowfish
Forktail Blue-eye Rainbowfish
Forktail Blue-eye Rainbowfish
Forktail Blue-eye Rainbowfish
Fork Tail Blue Eye Rainbowfish
Quick Facts
Scientific NamePseudomugil furcatus
Other NamesForktailed Rainbowfish, Blue Eye Forktail Rainbowfish
OriginsPapua New Guinea
Aquarium LevelMiddle
Best kept asGroups 5+
Lifespanup to 3 year
Water Parameters
Water TypeFreshwater
PH6.0 - 8.0
GH8 - 18
KH5 - 12
75 - 79℉
23.9 - 26.1℃


In the home aquarium, the Forktail Blue Eye Rainbowfish will readily accept most good quality dried foods such as granules, flakes and sinking pellets. These modern food products have been developed to provide all adequate nutrition to maintain your fish's health and dietary requirements.

Providing additional foodstuffs such as live, frozen, and freeze-dried meals such as bloodworm, daphnia, and tubifex once or twice a week will provide additional benefits to your fish's health and well-being but is not a must for this fish.

It should be noted that bloodworms should only be given as an occasional treat and should not be used as the staple diet as they are difficult for fish to digest and can potentially cause blockages.

This fish is an omnivore in the wild, meaning it will consume some vegetable matter. Although most modern fish foods take this into account and include them in their products, you can still supplement your fish's diet with blanched vegetables such as spinach, broccoli, and zucchini. Ensure you do not overfeed your fish and remove any leftovers the following day.

Tank Mates

2 interesting tank mate ideas for the Forktail Blue Eye Rainbowfish could include:

Dwarf Gourami(Trichogaster lalius)
Staeck Endler(Poecilia wingei)

Sexual Dimorphism

It is simple to differentiate between a male and female Forktail Blue-eye Rainbowfish. The males are more intensely patterned than the females, and the unpaired fins in the males become noticeably extended as they develop. In contrast, the females are duller, and their patterning is not as intricate as the males.


Breeding the Forktail Blue Eye Rainbowfish is straightforward once these fish are happily established and settled into your aquarium. You will need a mature pair or group of males and females, along with a spawning mop, preferably floating at the top of the aquarium downwards to the substrate.

Despite spawning year-round, Rainbowfish lay many eggs at the beginning of the rainy season. In addition, temperature increases, and live and frozen foods often encourage spawning.

Check your spawning mops daily for any eggs that have been deposited and either remove the eggs from the mop or, better still, remove the entire mop to avoid contamination of the Rainbowfish eggs.

Tip: Have several spawning mops at hand so you can place a fresh spawning mop into the aquarium while you wait for the eggs to hatch on the other mop/s.

Place the spawning mop with eggs still attached into a separate small cycled aquarium with a sponge filter for flow, and add a few drops of Methylene Blue (Methylene Blue helps prevent fungal infections of eggs).

Your rainbowfish Eggs will hatch within 7 to 18 days, depending on the species and the temperature. We recommend 27°C = 80.6°F for the fastest development of fry.

Once the Rainbowfish fry hatch, they absorb their yolk sacs quickly and become free swimming, moving towards the water's surface. Once the fry reaches the water's surface, you can start feeding. We recommend feeding on Micorworm (the most straightforward live food to culture) and decapsulated brine shrimp egg powder several times a day while being careful not to overfeed and pollute the water column.

After a week or two, you can start to add newly hatched brine shrimp, but this isn't necessary to achieve a high success rate in our experience.

Rainbowfish fry grows slowly, so you should expect to wait several months before the fry is large enough to be added to the adult colony.

Other Rainbowfish of interest

Banded Rainbowfish(Melanotaenia trifasciata)
Boesemans Rainbowfish(Melanotaenia Boesemani)
Celebes Rainbowfish(Marosatherina ladigesi)
Dwarf Neon Rainbowfish(Melanotaenia praecox)
Honey Blue Eye Rainbowfish(Pseudomugil Mellis)
Ivantsoffs Blue Eye Rainbowfish(Pseudomugil ivantsoffi)
View all Rainbowfish
Date Added: 13/08/2020 - Updated: 12/08/2022 12:30:22