Penguin Tetra (Aphyocharax paraguayensis)

Description

Penguin Tetra (Aphyocharax paraguayensis)

Active, graceful and instantly recognisable, the Penguin Tetra is a lively South American schooling fish admired for its streamlined silver body and distinctive black lateral stripe that resembles the markings of a penguin. Constantly on the move yet peaceful in nature, it makes an excellent addition to planted community aquariums.

Quick Facts

  • Scientific name: Aphyocharax paraguayensis
  • Common name: Penguin Tetra
  • Current size: Approximately 3–4 cm
  • Adult size: Approximately 5–6 cm
  • Tank size: 75L+ recommended
  • Difficulty: 🟢 Easy
  • Temperament: Peaceful, active schooling fish
  • Minimum school: 8+ recommended

Is this for you?

āœ”ļø Perfect if:

  • You enjoy active schooling fish that are always on display.
  • You're creating a planted South American community aquarium.
  • You want a hardy species with unique natural markings.
  • You have plenty of open swimming space available.

āŒ Avoid if:

  • You only intend to keep one or two fish.
  • You keep large aggressive or predatory fish.
  • Your aquarium has unstable water conditions.
  • You keep very timid or delicate long-finned species that may be disturbed by active swimmers.

Why choose Penguin Tetras?

The Penguin Tetra is instantly recognisable thanks to its bold black stripe that runs from the snout through the body and into the lower lobe of the tail. Combined with its shimmering silver body, this distinctive pattern creates a sleek, elegant appearance unlike almost any other tetra.

Native to the Paraguay River Basin, this species thrives in mature planted aquariums with open swimming areas, driftwood and dense vegetation around the edges. Their active schooling behaviour keeps them constantly visible, making them one of the more engaging mid-water community fish.

When maintained in larger groups, Penguin Tetras become more confident and display beautiful synchronised swimming as they patrol the aquarium together.

Benefits

  • Distinctive black "penguin" stripe
  • Beautiful metallic silver body
  • Active and entertaining schooling behaviour
  • Hardy and adaptable community fish
  • Excellent for planted aquariums
  • Suitable for beginners and experienced aquarists alike

Care made simple

  • Temperature: 22–27°C
  • pH: 6.0–7.5
  • Diet: Quality flakes, micro pellets, frozen foods and live foods
  • Water: Clean, stable and well-filtered with gentle to moderate water movement
  • Setup: Planted aquarium with driftwood, open swimming areas and dense planting around the edges
  • Keep in schools of at least 8 fish to encourage natural behaviour and reduce stress.
  • A varied diet and regular water changes will help maintain their metallic sheen and crisp black markings.

Pairs perfectly with

  • Corydoras sterbai
  • Black Neon Tetras
  • Glowlight Tetras
  • Honey Gouramis
  • Bristlenose Plecos
NTA Insight:
Penguin Tetras look spectacular in aquariums with dark substrates and lush green plants, where their bold black stripe becomes even more pronounced. Schools of 10–15 fish create a constantly moving ribbon of silver and black that adds energy and elegance to the middle of the aquarium without overwhelming other peaceful species.

FAQ

How many Penguin Tetras should I keep?

We recommend keeping at least 8 fish together. Larger schools encourage stronger shoaling behaviour, reduce stress and create a far more impressive display.

Are Penguin Tetras peaceful?

Yes. They are peaceful community fish, although they are more active than many other tetra species. They are best kept with similarly sized, peaceful tank mates.

Can they live in planted aquariums?

Absolutely. Penguin Tetras thrive in planted aquariums that combine dense vegetation with generous open swimming space.

Are they suitable for beginners?

Yes. Their hardy nature and adaptable temperament make them an excellent choice for beginners with an established community aquarium.

How long do Penguin Tetras live?

With stable water quality, good nutrition and regular maintenance, Penguin Tetras commonly live between 5 and 8 years.

Penguin Tetra (Aphyocharax paraguayensis)

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SKU: AST16L

20 in stock  

$6.00


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    Description

    Penguin Tetra (Aphyocharax paraguayensis)

    Active, graceful and instantly recognisable, the Penguin Tetra is a lively South American schooling fish admired for its streamlined silver body and distinctive black lateral stripe that resembles the markings of a penguin. Constantly on the move yet peaceful in nature, it makes an excellent addition to planted community aquariums.

    Quick Facts

    • Scientific name: Aphyocharax paraguayensis
    • Common name: Penguin Tetra
    • Current size: Approximately 3–4 cm
    • Adult size: Approximately 5–6 cm
    • Tank size: 75L+ recommended
    • Difficulty: 🟢 Easy
    • Temperament: Peaceful, active schooling fish
    • Minimum school: 8+ recommended

    Is this for you?

    āœ”ļø Perfect if:

    • You enjoy active schooling fish that are always on display.
    • You're creating a planted South American community aquarium.
    • You want a hardy species with unique natural markings.
    • You have plenty of open swimming space available.

    āŒ Avoid if:

    • You only intend to keep one or two fish.
    • You keep large aggressive or predatory fish.
    • Your aquarium has unstable water conditions.
    • You keep very timid or delicate long-finned species that may be disturbed by active swimmers.

    Why choose Penguin Tetras?

    The Penguin Tetra is instantly recognisable thanks to its bold black stripe that runs from the snout through the body and into the lower lobe of the tail. Combined with its shimmering silver body, this distinctive pattern creates a sleek, elegant appearance unlike almost any other tetra.

    Native to the Paraguay River Basin, this species thrives in mature planted aquariums with open swimming areas, driftwood and dense vegetation around the edges. Their active schooling behaviour keeps them constantly visible, making them one of the more engaging mid-water community fish.

    When maintained in larger groups, Penguin Tetras become more confident and display beautiful synchronised swimming as they patrol the aquarium together.

    Benefits

    • Distinctive black "penguin" stripe
    • Beautiful metallic silver body
    • Active and entertaining schooling behaviour
    • Hardy and adaptable community fish
    • Excellent for planted aquariums
    • Suitable for beginners and experienced aquarists alike

    Care made simple

    • Temperature: 22–27°C
    • pH: 6.0–7.5
    • Diet: Quality flakes, micro pellets, frozen foods and live foods
    • Water: Clean, stable and well-filtered with gentle to moderate water movement
    • Setup: Planted aquarium with driftwood, open swimming areas and dense planting around the edges
    • Keep in schools of at least 8 fish to encourage natural behaviour and reduce stress.
    • A varied diet and regular water changes will help maintain their metallic sheen and crisp black markings.

    Pairs perfectly with

    • Corydoras sterbai
    • Black Neon Tetras
    • Glowlight Tetras
    • Honey Gouramis
    • Bristlenose Plecos
    NTA Insight:
    Penguin Tetras look spectacular in aquariums with dark substrates and lush green plants, where their bold black stripe becomes even more pronounced. Schools of 10–15 fish create a constantly moving ribbon of silver and black that adds energy and elegance to the middle of the aquarium without overwhelming other peaceful species.

    FAQ

    How many Penguin Tetras should I keep?

    We recommend keeping at least 8 fish together. Larger schools encourage stronger shoaling behaviour, reduce stress and create a far more impressive display.

    Are Penguin Tetras peaceful?

    Yes. They are peaceful community fish, although they are more active than many other tetra species. They are best kept with similarly sized, peaceful tank mates.

    Can they live in planted aquariums?

    Absolutely. Penguin Tetras thrive in planted aquariums that combine dense vegetation with generous open swimming space.

    Are they suitable for beginners?

    Yes. Their hardy nature and adaptable temperament make them an excellent choice for beginners with an established community aquarium.

    How long do Penguin Tetras live?

    With stable water quality, good nutrition and regular maintenance, Penguin Tetras commonly live between 5 and 8 years.

    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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