Max Size: 3.5cm

Ivantsoffs Blue Eye Rainbowfish (Pseudomugil ivantsoffi)

Ivantsoff's Blue Eye Rainbowfish are peaceful, stunning and somewhat rare. These fish are also relatively hardy, making them suitable for beginner aquarists as well as ideal members of a species only nano aquarium or a well-planted community aquarium alongside other species similar in size and disposition.

Ivantsoff's Blue Eye Rainbowfish are schooling fish in nature and will exhibit their best colours when you keep them in a group of 6 or more individuals, including numerous males. However, you must maintain these fish in a heavily planted, spacious aquarium to ensure that dominant males do not overly harass subdominant males.

Ideal tankmates for Ivantsoff's Blue Eye Rainbowfish could include other smaller Rainbowfish species; however, avoid housing them with other Rainbowfish from the genus Pseudamugil otherwise, hybridisation may occur. Other possible tankmates can include other peaceful fish species of similar size, disposition, and water requirements, such as smaller Barbs, Gobies, Rasboras and Corydoras Catfish. It would be best to avoid maintaining them alongside much larger, more aggressive species; otherwise, they will become withdrawn and easily stressed.

It would be best if you kept Ivantsoff's Blue Eye Rainbowfish in an aquarium with a slow current as these fish originate from calmer waters. In addition, having a darker substrate would also benefit you as their colours will stand out more.

Ivantsoff's Blue Eye Rainbowfish have a semi-transparent head and body with a blueish or reddish hue, bright blue eyes and their operculum and swim bladder are silvery. In addition, the upper half of the first dorsal, as well as the anterior half of the second dorsal fins and the edge of the anal fin, are bright red.

The ventral and dorsal shapes posterior to the second dorsal and anal fins are also edged in red, as is the upper and lower third of the caudal fin. The pelvic fins are a pinkish colour, and the edges of some scales on the abdomen have narrow black margins.

Ivantsoffs Blue Eye Rainbowfish (Pseudomugil ivantsoffi) Video

Ivantsoff's Blue Eye Rainbowfish (Pseudomugil ivantsoffi) - Rare Rainbowfish Profile & Care Guide


Ivantsof's Blue-eye Rainbowfish
Ivantsof's Blue-eye Rainbowfish
Ivantsoff's Blue Eye Rainbowfish
Ivantsoff's Blue Eye Rainbowfish
Ivantsoff's Blue Eye Rainbowfish
Ivantsoff's Blue Eye Rainbowfish
Quick Facts
Scientific NamePseudomugil ivantsoffi
Year Described1999
Other NamesIvantsoffi Rainbowfish
Aquarium LevelMiddle
DifficultyBeginner - Intermediate
Best kept asGroups 8+
Lifespan3 - 5 years
Water Parameters
Water TypeFreshwater
PH6.0 - 8.0
GH5 - 15
KH1 - 5
75 - 85℉
23.9 - 29.4℃

Natural Habitat

Kopi River


In the home aquarium, the Ivantsoffs 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

10 interesting tank mate ideas for the Ivantsoffs Blue Eye Rainbowfish could include:

Adolfos Catfish(Corydoras adolfoi)
Cherry Barb(Puntius titteya)
Chilli Rasbora(Boraras Brigittae)
Delphax Corydoras(Corydoras Delphax)
Dwarf Neon Rainbowfish(Melanotaenia praecox)
Dwarf Pencilfish(Nannostomus marginatus)
Dwarf Rasbora(Boraras maculatus)
Pentazona Barb(Desmopuntius Pentazona)
Phoenix Rasbora(Boraras Merah)
Purple Pencilfish(Nannostomus rubrocaudatus)

Sexual Dimorphism

It is pretty straightforward to differentiate between the male and female Ivantsoff's Blue Eye Rainbowfish. The males are generally slimmer and more vibrantly coloured, with their fins being a bright red colour, whereas the female's fins are translucent to faint yellow except for the edges of the first and second dorsal fins, which are yellow.


Breeding the Ivantsoffs 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)
Forktail Blue Eye Rainbowfish(Pseudomugil furcatus)
Honey Blue Eye Rainbowfish(Pseudomugil Mellis)
View all Rainbowfish
Date Added: 15/03/2022 10:15:50 - Updated: 12/08/2022 12:38:19