Max Size: 3.5cm

Transparent Blue Eye Rainbowfish (pseudomugil pellucidus)

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

Transparent Blue Eye Rainbowfish are schooling fish in nature and exhibit their best colours when you keep them in a group of 8 or more individuals. 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 the Transparent Blue Eye Rainbowfish could include other smaller Rainbowfish species such as the Ornate Rainbowfish and the Dwarf Neon Rainbowfish; 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 like the Five-Banded Barb, the Dwarf Golden Barb and Cherry Barbs, as well as Gobies and Micro Rasboras. Again, however, you should avoid maintaining them alongside much larger, more aggressive species; otherwise, they will become withdrawn and easily stressed.

It would be best to keep Transparent Blue Eye Rainbowfish in an aquarium with slow water flow as these fish originate from calmer waters. In addition, having a darker substrate would also benefit you as their colours will stand out more.

The Transparent Bue Eye Rainbowfish has a small, slender body, and its head is a silvery red that merges into the gill cover and stomach area. The rest of the body is relatively transparent. The swim bladder is translucent and seeable. In addition, these Rainbowfish also have a lateral line that can vary from red to yellow depending on the location that starts at the top, then changes to black and extends over the caudal peduncle and spreads out over the caudal fin in the form of thick black stripes across the mid-tail rays.

The first dorsal fin on this fish is matte black, with a slightly orange splash on the first dorsal fin ray. The second dorsal fin is dark, with the rays saturated with black pigment cells forming black bars, posteriorly edged with bright orange. In addition, they have thin black and orange bands that extend throughout the anal fin. The upper half of the caudal fin has splashes of orangey-yellow, and the margins of the scales are black above the lateral line and slightly black below the lateral line. Lastly, the anal fin stripe can differ from yellow to red in specific individuals.


Transparent Blue-eye Rainbowfish
Transparent Blue-eye Rainbowfish
Quick Facts
Scientific Namepseudomugil pellucidus
Year Described1998
Other NamesNone
Aquarium LevelMiddle - Top
DifficultyBeginner - Intermediate
Best kept asGroups 8+
Lifespan3 - 5 years
Water Parameters
Water TypeFreshwater
PH6.5 - 8.0
GH5 - 15
75 - 82℉
23.9 - 27.8℃


In the home aquarium, the Transparent 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.

Sexual Dimorphism

It is pretty straightforward to differentiate between the Transparent Blue Eye Rainbowfish male and female. The males are usually slightly larger than females and have much brighter colouration and more extended fins. In contrast, the females are somewhat fatter when carrying eggs are smaller and much duller than males.


Breeding the Transparent 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 11:57:51 - Updated: 12/08/2022 13:25:08