Max Size: 5.5cm

Forktail Blue Eye Rainbowfish (Pseudomugil furcatus)

The Forktail Blue-eye Rainbowfish 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 their 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.

Tank Mates for the Forktail Blue Eye Rainbowfish

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

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

Photos of the Forktail Blue Eye Rainbowfish

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


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

Natural Habitat

The Forktail Blue-eye Rainbow Fish are endemic to Collingwood Bay and Dyke Ackland Bay in Papua New Guinea. These Rainbowfish inhabit clear, lowland, slow-moving streams and pools surrounded by dense vegetation. The substrate in their habitats consists of sand and rocks.

What to feed the Forktail Blue Eye Rainbowfish

Forktail Blue-eye Rainbowfish are easy to feed and have no special requirements when it comes to what they eat. However, you should provide them with a varied diet. It would be best to use high-quality dried food such as flakes or granules as the staple diet supplementing this with live, frozen or freeze-dried foods such as brine shrimp, cyclops, bloodworm or daphnia.

How to sex the Forktail Blue Eye Rainbowfish

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.

How to breed the Forktail Blue Eye Rainbowfish

Forktail Blue-eye Rainbowfish are egg-scattering spawners who exhibit no parental care and consume their own eggs and fry if they are given the opportunity.

Spawning is more likely to occur in temperatures towards the upper end of the range. Females can deposit a few eggs daily for several days, attaching them to aquatic vegetation or spawning mops. An individual male might also mate with multiple females in a single day, and spawning will usually continue throughout the day during warmer periods.

There are two primary methods for breeding these fish. The first involves separating a small group of 6 to 8 individuals or a single male and two or three females into a breeding tank with an air-powered sponge filter and spawning media such as nylon mops or java moss. You should check the media daily and if any eggs are spotted, remove them to a separate tank for incubating and hatching.

Alternatively, you can maintain a colony of adults in a more extensive, fully-decorated setup that should allow some fry to survive if well-planted.

The Rainbowfish fry initially spends most of their time close to the water's surface; therefore, it would be best to attach aquatic plants to d├ęcor high in the water column as this will produce the most favourable results. Floating plants with long roots are also recommended and will work just as well.

The second method is usually less productive but more straightforward and reliable. Also, a well-established planted aquarium offers relatively stable water conditions. In addition, the microfauna that grows can create a valuable early food source for the babies.

The eggs will usually hatch between 14 and 21 days later, depending on temperature, and the fry will be able to accept good quality dried powder, baby brine shrimp and microworm immediately. It would be better if you offered the fry small meals twice a day.

Aged water can result in a high mortality rate; therefore, it is essential that you perform small water changes every 2 to 3 days. In addition, any uneaten food should not be allowed to accumulate in the raising tank.

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: 02/02/2022 16:26:24