Pseudomugil tenellus Delicate Blue Eyes 3cm

Description

Pseudomugil tenellus

A delicate Australian Blue Eye Rainbowfish featuring brilliant sapphire-blue eyes, translucent golden fins, and peaceful schooling behaviour that's perfect for planted nano aquariums.

Quick Facts

  • Scientific name: Pseudomugil tenellus
  • Common name: Delicate Blue Eye
  • Adult size: 3–4 cm
  • Tank size: 40L+ recommended
  • Difficulty: 🟢 Easy
  • Temperament: Peaceful
  • Best kept: Schools of 8 or more

Is this for you?

✔️ Perfect if:

  • You love peaceful nano fish.
  • You keep a heavily planted aquarium.
  • You enjoy schooling fish with natural behaviour.
  • You want an Australian native species.

❌ Avoid if:

  • You keep large or aggressive fish.
  • You plan to keep only one or two individuals.
  • Your aquarium has strong water flow.
  • You don't have a secure-fitting lid.

Why choose Pseudomugil tenellus?

Pseudomugil tenellus is one of Australia's most elegant Blue Eye Rainbowfish. While more subtly coloured than some of its relatives, its shimmering body, vivid blue eyes and delicate yellow-tinted fins create an understated beauty that's especially striking in planted aquariums.

Males regularly display to one another by extending their fins and performing short courtship dances, providing constant activity without serious aggression. Their peaceful temperament makes them ideal for community aquariums filled with other small fish.

When maintained in large schools with dark substrate and lush planting, their colours become noticeably more vibrant while their natural schooling behaviour is on full display.

Common mistakes

  • Keeping too few individuals.
  • Housing them with boisterous or predatory fish.
  • Leaving the aquarium uncovered—they are capable jumpers.
  • Providing little plant cover.
  • Allowing water quality to decline.

Care made simple

  • Temperature: 22–28°C
  • pH: 6.5–7.8
  • Diet: Premium nano pellets, flakes, baby brine shrimp, daphnia and other small live or frozen foods
  • Water: Clean, stable and well-filtered
  • Setup: Heavily planted aquarium with open swimming space and a secure lid

Pairs perfectly with

  • Pacific Blue Eyes
  • Pseudomugil luminatus
  • Corydoras
  • Otocinclus
  • Java Moss and fine-leaved aquatic plants
NTA Insight:
Pseudomugil tenellus is often overshadowed by the brighter Luminatus, but it's one of the most graceful Blue Eyes available. In a well-planted aquarium with a large school, the males constantly display to each other, flashing their brilliant blue eyes while weaving through the plants. They're a fantastic choice for aquarists who appreciate natural beauty over bold colours.

FAQ

How many Pseudomugil tenellus should I keep?

We recommend keeping at least eight fish, although schools of 10–20 individuals display the best colours and most natural behaviour.

Can they live with shrimp?

Yes. Adult shrimp are generally safe, although very small shrimplets may occasionally become food. Dense mosses and plants provide excellent shelter.

Are they suitable for beginners?

Yes. They're hardy, peaceful and easy to care for, making them an excellent choice for both beginner and experienced fishkeepers.

Can they breed in home aquariums?

Absolutely. They readily scatter eggs amongst fine-leaved plants and spawning mops, making them one of the easier Blue Eye species to breed.

What makes Pseudomugil tenellus different from other Blue Eyes?

Rather than relying on bright reds or oranges, Pseudomugil tenellus stands out through its elegant body shape, brilliant sapphire-blue eyes and subtle golden finnage, making it one of the most graceful Australian Blue Eye species.

Pseudomugil tenellus Delicate Blue Eyes 3cm

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    Description

    Pseudomugil tenellus

    A delicate Australian Blue Eye Rainbowfish featuring brilliant sapphire-blue eyes, translucent golden fins, and peaceful schooling behaviour that's perfect for planted nano aquariums.

    Quick Facts

    • Scientific name: Pseudomugil tenellus
    • Common name: Delicate Blue Eye
    • Adult size: 3–4 cm
    • Tank size: 40L+ recommended
    • Difficulty: 🟢 Easy
    • Temperament: Peaceful
    • Best kept: Schools of 8 or more

    Is this for you?

    ✔️ Perfect if:

    • You love peaceful nano fish.
    • You keep a heavily planted aquarium.
    • You enjoy schooling fish with natural behaviour.
    • You want an Australian native species.

    ❌ Avoid if:

    • You keep large or aggressive fish.
    • You plan to keep only one or two individuals.
    • Your aquarium has strong water flow.
    • You don't have a secure-fitting lid.

    Why choose Pseudomugil tenellus?

    Pseudomugil tenellus is one of Australia's most elegant Blue Eye Rainbowfish. While more subtly coloured than some of its relatives, its shimmering body, vivid blue eyes and delicate yellow-tinted fins create an understated beauty that's especially striking in planted aquariums.

    Males regularly display to one another by extending their fins and performing short courtship dances, providing constant activity without serious aggression. Their peaceful temperament makes them ideal for community aquariums filled with other small fish.

    When maintained in large schools with dark substrate and lush planting, their colours become noticeably more vibrant while their natural schooling behaviour is on full display.

    Common mistakes

    • Keeping too few individuals.
    • Housing them with boisterous or predatory fish.
    • Leaving the aquarium uncovered—they are capable jumpers.
    • Providing little plant cover.
    • Allowing water quality to decline.

    Care made simple

    • Temperature: 22–28°C
    • pH: 6.5–7.8
    • Diet: Premium nano pellets, flakes, baby brine shrimp, daphnia and other small live or frozen foods
    • Water: Clean, stable and well-filtered
    • Setup: Heavily planted aquarium with open swimming space and a secure lid

    Pairs perfectly with

    • Pacific Blue Eyes
    • Pseudomugil luminatus
    • Corydoras
    • Otocinclus
    • Java Moss and fine-leaved aquatic plants
    NTA Insight:
    Pseudomugil tenellus is often overshadowed by the brighter Luminatus, but it's one of the most graceful Blue Eyes available. In a well-planted aquarium with a large school, the males constantly display to each other, flashing their brilliant blue eyes while weaving through the plants. They're a fantastic choice for aquarists who appreciate natural beauty over bold colours.

    FAQ

    How many Pseudomugil tenellus should I keep?

    We recommend keeping at least eight fish, although schools of 10–20 individuals display the best colours and most natural behaviour.

    Can they live with shrimp?

    Yes. Adult shrimp are generally safe, although very small shrimplets may occasionally become food. Dense mosses and plants provide excellent shelter.

    Are they suitable for beginners?

    Yes. They're hardy, peaceful and easy to care for, making them an excellent choice for both beginner and experienced fishkeepers.

    Can they breed in home aquariums?

    Absolutely. They readily scatter eggs amongst fine-leaved plants and spawning mops, making them one of the easier Blue Eye species to breed.

    What makes Pseudomugil tenellus different from other Blue Eyes?

    Rather than relying on bright reds or oranges, Pseudomugil tenellus stands out through its elegant body shape, brilliant sapphire-blue eyes and subtle golden finnage, making it one of the most graceful Australian Blue Eye species.

    Live Arrival & Ordering FAQ

    Why do livestock prices sometimes change?

    Unlike manufactured products, fish and shrimp continue to grow and develop over time. Their value changes as they increase in size, develop colour, or become breeding pairs.

    Our prices are based on the current size, quality and availability of each specimen. While pricing often remains stable for around 3–4 months, it may be updated at any time to reflect these changes.

    We always aim to offer healthy, high-quality livestock at fair and competitive prices.

    Do you offer a live arrival guarantee?

    Yes. All livestock is covered by our Live Arrival Guarantee.

    In the rare event of DOA, please contact us promptly with clear photos of the livestock in the original unopened bag.

    Please review our full DOA and store policies before purchase.

    Can you ship to all states in Australia?

    No. Due to state restrictions, we cannot ship livestock or live plants to WA and TAS.

    What should I check before ordering?

    Before placing an order, make sure:

    • Your tank is fully cycled and stable
    • Your aquarium has enough space for the species
    • Your current livestock are compatible in temperament, size, and requirements
    • Your water parameters, habitat, and temperature suit the species
    • You are not adding too many fish at once
    What should I expect when my fish arrives?

    It is normal for fish, shrimp, or snails to look pale, stressed, or less active after shipping.

    This is temporary. Most livestock will settle and regain colour within a few days.

    How long does it take for fish to settle in?

    Most livestock will take 3–7 days to fully adjust to their new environment.

    Should I feed my fish immediately after arrival?

    No. We recommend waiting 24 hours before feeding to allow them to settle.

    If you already have fish in your tank, feeding them before introducing new arrivals can help reduce stress.

    Why do fish sometimes struggle after being added to a tank?

    In most cases, issues are caused by tank conditions, not shipping.

    • Uncycled or unstable tanks
    • Poor water parameters
    • Overstocking
    • Unsuitable tank mates
    What is Nano Tanks Australia’s main tip for new livestock?

    Most livestock losses happen in immature or unstable tanks, not during shipping.

    If your setup is not fully established, the risk to new arrivals is significantly higher.

    Not sure if this fish is right for your setup?

    If you are unsure whether this species suits your setup, contact us before ordering and we’ll help point you in the right direction.

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