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Fish

Forktail blue-eye

Pseudomugil furcatus
French name : Pseudomugil à nageoires jaunes

Pseudomugil furcatus, the forktail blue-eye or forktail rainbowfish, is a small rainbowfish in the family Pseudomugilidae, native to clear coastal streams of eastern Papua New Guinea. It has a translucent yellow-green body, blue-ringed eyes, and yellow-edged fins, with the paired dorsal fins and forked tail that give it its name. It is a peaceful, active shoaling species best kept in groups, where males spread their fins in constant courtship display. It suits a peaceful community of small, gentle fish. It thrives in a well-planted aquarium with clean, well-oxygenated water and gentle flow, appreciating fine-leaved plants and floating cover. It is an omnivore taking small flakes, micropellets, and live or frozen foods such as daphnia and baby brine shrimp. It is a continuous egg-scatterer that deposits eggs among fine plants or spawning mops, and dedicated keepers can raise the fry with small live foods.

Water
Freshwater
Origin
Coastal streams, eastern Papua New Guinea
Adult size
5 cm
Diet
Omnivore
Temperament
Peaceful
Difficulty
Intermediate
Keep in group of
8+
Forktail blue-eye (Pseudomugil furcatus)
Illustration

Water parameters

Temperature22 – 26 °C
pH6.5 – 8
Carbonate hardness (KH)4 – 12 °dKH
General hardness (GH)6 – 15 °dGH

Tank & stocking

Minimum tank volume60 L
Volume budget per individual 6 L — adds up with tank-mates
Minimum group size8 individuals (shoaling)

“Minimum tank volume” is a reasonable floor, not an absolute limit. The per-individual budget is used by the Aqua app to estimate how heavily a tank is stocked.

Frequently asked questions

What size aquarium does Forktail blue-eye need?

Provide at least 60 litres for a small group to keep Forktail blue-eye in good conditions.

What water parameters does Forktail blue-eye need?

A temperature of 22–26 °C, pH 6.5–8.

Is Forktail blue-eye peaceful or aggressive?

Its temperament is peaceful.

What does Forktail blue-eye eat?

Its diet: omnivore.

How many Forktail blue-eye should be kept together?

It is a social species: keep a group of at least 8.

How big does Forktail blue-eye get?

Around 5 cm as an adult.

Is Forktail blue-eye suitable for beginners?

Care level: intermediate.

Planning a tank with Forktail blue-eye?

AquaTender turns these parameters into live advice: it checks whether your tank is big enough, how heavily it's stocked, and whether your fish are compatible — then tracks water tests, photos and maintenance for you.

➕ Add Forktail blue-eye to my tank Discover AquaTender
« Add to my tank » opens AquaTender — sign in (free) and pick your aquarium.

Fish from the same biotope

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