Emerald Dwarf Rasbora (Danio erythromicron) 2-4cm

Description

Emerald Dwarf Rasbora (Danio erythromicron)

A stunning nano fish featuring shimmering emerald-green flanks, brilliant orange fins and peaceful schooling behaviour, making it an exceptional choice for planted and aquascaped aquariums.

Quick Facts

  • Scientific name: Danio erythromicron
  • Common name: Emerald Dwarf Rasbora, Emerald Dwarf Danio
  • Adult size: 2–3 cm
  • Tank size: 30L+ recommended
  • Difficulty: 🟢 Easy
  • Temperament: Peaceful
  • Best kept: Schools of 10 or more

Is this for you?

āœ”ļø Perfect if:

  • You love nano fish and planted aquariums.
  • You keep shrimp or peaceful community fish.
  • You enjoy subtle but brilliant natural colours.
  • You want an uncommon alternative to Celestial Pearl Danios.

āŒ Avoid if:

  • You keep large or aggressive fish.
  • You have a newly established aquarium.
  • You plan to keep only a handful of fish.
  • You prefer fast-flowing river aquariums.

Why choose the Emerald Dwarf Rasbora?

The Emerald Dwarf Rasbora is one of the most underrated nano fish available. Its slender body shimmers with iridescent emerald-green and blue vertical stripes, while the fins glow with vibrant orange and red highlights. Under quality LED lighting, mature fish become absolutely breathtaking.

Although closely related to the Celestial Pearl Danio, Emerald Dwarf Rasboras are more streamlined in appearance and tend to spend more time gently cruising through the middle of the aquarium. Males display to one another by extending their colourful fins and intensifying their colours, creating an incredible natural display.

Their peaceful nature makes them ideal for heavily planted aquariums, aquascapes and shrimp colonies where they can truly thrive.

Benefits

  • Brilliant emerald-blue striped colouration
  • Perfect for nano aquariums
  • Completely peaceful community fish
  • Excellent with ornamental shrimp
  • Ideal for planted aquascapes
  • Active without being boisterous

Care made simple

  • Temperature: 20–26°C
  • pH: 6.5–7.5
  • Diet: Micro pellets, crushed flakes, baby brine shrimp, daphnia and other fine frozen or live foods
  • Water: Clean, mature and stable with gentle flow
  • Setup: Heavily planted aquarium with mosses, driftwood, leaf litter and open swimming areas

Pairs perfectly with

  • Celestial Pearl Danios
  • Cherry Shrimp
  • Crystal Shrimp
  • Pygmy Corydoras
  • Otocinclus
NTA Insight:
If Celestial Pearl Danios are the stars of a planted aquarium, Emerald Dwarf Rasboras are the emerald jewels. They don't always show their best colours in store tanks, but once settled into a mature planted aquarium with dark substrate and quality food, the iridescent green stripes become absolutely spectacular. We recommend keeping at least 10–12 together for the most natural behaviour and colour.

FAQ

How many Emerald Dwarf Rasboras should I keep?

They are true schooling fish and should be kept in groups of at least 10. Larger schools create a more natural display, improve confidence and encourage stronger colouration.

Are Emerald Dwarf Rasboras peaceful?

Yes. They are exceptionally peaceful and are ideal for nano community aquariums with other small, non-aggressive fish.

Can they live with shrimp?

Absolutely. They are excellent companions for Neocaridina and Caridina shrimp. Very young shrimplets may occasionally be eaten, but dense mosses and plants provide excellent protection.

Can Emerald Dwarf Rasboras breed in home aquariums?

Yes. They will often spawn in mature planted aquariums, scattering eggs among mosses and fine-leaved plants. A separate breeding setup greatly improves fry survival.

What's the difference between Emerald Dwarf Rasboras and Celestial Pearl Danios?

Both are closely related and share similar care requirements, but Emerald Dwarf Rasboras have a slimmer body with iridescent vertical green-blue striping, while Celestial Pearl Danios have a darker body covered in pearly spots with brighter orange-red fins.

Emerald Dwarf Rasbora (Danio erythromicron) 2-4cm

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šŸ“¦ Arrival Date: 20 January 2026

4 in stock  

$25.00


All prices include GST
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    Description

    Emerald Dwarf Rasbora (Danio erythromicron)

    A stunning nano fish featuring shimmering emerald-green flanks, brilliant orange fins and peaceful schooling behaviour, making it an exceptional choice for planted and aquascaped aquariums.

    Quick Facts

    • Scientific name: Danio erythromicron
    • Common name: Emerald Dwarf Rasbora, Emerald Dwarf Danio
    • Adult size: 2–3 cm
    • Tank size: 30L+ recommended
    • Difficulty: 🟢 Easy
    • Temperament: Peaceful
    • Best kept: Schools of 10 or more

    Is this for you?

    āœ”ļø Perfect if:

    • You love nano fish and planted aquariums.
    • You keep shrimp or peaceful community fish.
    • You enjoy subtle but brilliant natural colours.
    • You want an uncommon alternative to Celestial Pearl Danios.

    āŒ Avoid if:

    • You keep large or aggressive fish.
    • You have a newly established aquarium.
    • You plan to keep only a handful of fish.
    • You prefer fast-flowing river aquariums.

    Why choose the Emerald Dwarf Rasbora?

    The Emerald Dwarf Rasbora is one of the most underrated nano fish available. Its slender body shimmers with iridescent emerald-green and blue vertical stripes, while the fins glow with vibrant orange and red highlights. Under quality LED lighting, mature fish become absolutely breathtaking.

    Although closely related to the Celestial Pearl Danio, Emerald Dwarf Rasboras are more streamlined in appearance and tend to spend more time gently cruising through the middle of the aquarium. Males display to one another by extending their colourful fins and intensifying their colours, creating an incredible natural display.

    Their peaceful nature makes them ideal for heavily planted aquariums, aquascapes and shrimp colonies where they can truly thrive.

    Benefits

    • Brilliant emerald-blue striped colouration
    • Perfect for nano aquariums
    • Completely peaceful community fish
    • Excellent with ornamental shrimp
    • Ideal for planted aquascapes
    • Active without being boisterous

    Care made simple

    • Temperature: 20–26°C
    • pH: 6.5–7.5
    • Diet: Micro pellets, crushed flakes, baby brine shrimp, daphnia and other fine frozen or live foods
    • Water: Clean, mature and stable with gentle flow
    • Setup: Heavily planted aquarium with mosses, driftwood, leaf litter and open swimming areas

    Pairs perfectly with

    • Celestial Pearl Danios
    • Cherry Shrimp
    • Crystal Shrimp
    • Pygmy Corydoras
    • Otocinclus
    NTA Insight:
    If Celestial Pearl Danios are the stars of a planted aquarium, Emerald Dwarf Rasboras are the emerald jewels. They don't always show their best colours in store tanks, but once settled into a mature planted aquarium with dark substrate and quality food, the iridescent green stripes become absolutely spectacular. We recommend keeping at least 10–12 together for the most natural behaviour and colour.

    FAQ

    How many Emerald Dwarf Rasboras should I keep?

    They are true schooling fish and should be kept in groups of at least 10. Larger schools create a more natural display, improve confidence and encourage stronger colouration.

    Are Emerald Dwarf Rasboras peaceful?

    Yes. They are exceptionally peaceful and are ideal for nano community aquariums with other small, non-aggressive fish.

    Can they live with shrimp?

    Absolutely. They are excellent companions for Neocaridina and Caridina shrimp. Very young shrimplets may occasionally be eaten, but dense mosses and plants provide excellent protection.

    Can Emerald Dwarf Rasboras breed in home aquariums?

    Yes. They will often spawn in mature planted aquariums, scattering eggs among mosses and fine-leaved plants. A separate breeding setup greatly improves fry survival.

    What's the difference between Emerald Dwarf Rasboras and Celestial Pearl Danios?

    Both are closely related and share similar care requirements, but Emerald Dwarf Rasboras have a slimmer body with iridescent vertical green-blue striping, while Celestial Pearl Danios have a darker body covered in pearly spots with brighter orange-red fins.

    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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