Assorted Comet Goldfish 5-6cm

Description

Comet Goldfish (Carassius auratus)

A classic favourite with graceful flowing fins and incredible speed, the Comet Goldfish is a hardy, active fish that thrives in spacious aquariums and ponds, bringing years of enjoyment to aquarists of all experience levels.

Quick Facts

  • Scientific name: Carassius auratus
  • Common name: Comet Goldfish
  • Adult size: 25–30 cm (larger in ponds)
  • Tank size: 200L+ recommended for juveniles, larger as they mature
  • Difficulty: 🟢 Very Easy
  • Temperament: Peaceful & Active
  • Best kept: Groups of 2 or more

Is this for you?

✔️ Perfect if:

  • You want a hardy, long-lived pet fish.
  • You have a large aquarium or outdoor pond.
  • You enjoy active fish with plenty of personality.
  • You're looking for a beginner-friendly species.

❌ Avoid if:

  • You only have a small aquarium.
  • You want a tropical community tank.
  • You plan to keep delicate aquatic plants.
  • You expect them to stay small.

Why choose Comet Goldfish?

Comet Goldfish are one of the most recognisable goldfish varieties in the world. Their streamlined body and long flowing tail allow them to swim far faster than fancy goldfish, making them incredibly active and entertaining to watch.

Available in vibrant shades of orange, red, white, yellow and calico, Comets are extremely hardy and adapt well to a variety of outdoor ponds and large aquariums. With proper care, they can live for well over a decade and become surprisingly interactive, often recognising the people who feed them.

Unlike many tropical fish, Comets are coldwater fish and thrive in cooler temperatures without requiring an aquarium heater in most Australian homes.

Benefits

  • Hardy and beginner friendly
  • Beautiful flowing fins
  • Excellent pond fish
  • Long lifespan with proper care
  • Highly interactive and personable
  • Available in a wide range of colours

Care made simple

  • Temperature: 16–24°C
  • pH: 6.8–8.0
  • Diet: Premium goldfish pellets, fresh vegetables, gel foods and occasional frozen foods
  • Water: Clean, well-filtered and highly oxygenated
  • Setup: Large swimming areas with smooth décor and powerful filtration
  • Perform regular water changes, as goldfish produce significant waste.

Pairs perfectly with

  • Other Comet Goldfish
  • Shubunkins
  • Common Goldfish
  • Sarasa Comets
  • Suitable pond companions of similar size
NTA Insight:
One of the biggest myths in fishkeeping is that goldfish belong in bowls. They don't. Comet Goldfish are powerful swimmers that grow surprisingly large and deserve plenty of space. In a properly filtered aquarium or pond, they become incredibly interactive pets that can live for 10–20 years or even longer. Treat them like a long-term companion rather than a temporary pet, and they'll reward you with years of enjoyment.

FAQ

How big do Comet Goldfish grow?

Most Comet Goldfish reach 25–30 cm in home aquariums, with some pond fish growing even larger under ideal conditions.

Can Comet Goldfish live in a bowl?

No. Bowls do not provide enough swimming space, filtration or stable water quality. Comets require large aquariums or outdoor ponds to thrive.

Do Comet Goldfish need a heater?

Generally no. Comets are coldwater fish and are well suited to the temperatures experienced in most Australian homes. Avoid sudden temperature fluctuations.

How long do Comet Goldfish live?

With proper care, good filtration and a suitable environment, Comet Goldfish commonly live 10–20 years, with some individuals living even longer.

Can I keep Comet Goldfish with tropical fish?

It's generally not recommended. Comets prefer cooler water and have different dietary and environmental requirements than most tropical species. They are best kept with other single-tail goldfish or compatible pond fish.

Assorted Comet Goldfish 5-6cm

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$5.00


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    Description

    Comet Goldfish (Carassius auratus)

    A classic favourite with graceful flowing fins and incredible speed, the Comet Goldfish is a hardy, active fish that thrives in spacious aquariums and ponds, bringing years of enjoyment to aquarists of all experience levels.

    Quick Facts

    • Scientific name: Carassius auratus
    • Common name: Comet Goldfish
    • Adult size: 25–30 cm (larger in ponds)
    • Tank size: 200L+ recommended for juveniles, larger as they mature
    • Difficulty: 🟢 Very Easy
    • Temperament: Peaceful & Active
    • Best kept: Groups of 2 or more

    Is this for you?

    ✔️ Perfect if:

    • You want a hardy, long-lived pet fish.
    • You have a large aquarium or outdoor pond.
    • You enjoy active fish with plenty of personality.
    • You're looking for a beginner-friendly species.

    ❌ Avoid if:

    • You only have a small aquarium.
    • You want a tropical community tank.
    • You plan to keep delicate aquatic plants.
    • You expect them to stay small.

    Why choose Comet Goldfish?

    Comet Goldfish are one of the most recognisable goldfish varieties in the world. Their streamlined body and long flowing tail allow them to swim far faster than fancy goldfish, making them incredibly active and entertaining to watch.

    Available in vibrant shades of orange, red, white, yellow and calico, Comets are extremely hardy and adapt well to a variety of outdoor ponds and large aquariums. With proper care, they can live for well over a decade and become surprisingly interactive, often recognising the people who feed them.

    Unlike many tropical fish, Comets are coldwater fish and thrive in cooler temperatures without requiring an aquarium heater in most Australian homes.

    Benefits

    • Hardy and beginner friendly
    • Beautiful flowing fins
    • Excellent pond fish
    • Long lifespan with proper care
    • Highly interactive and personable
    • Available in a wide range of colours

    Care made simple

    • Temperature: 16–24°C
    • pH: 6.8–8.0
    • Diet: Premium goldfish pellets, fresh vegetables, gel foods and occasional frozen foods
    • Water: Clean, well-filtered and highly oxygenated
    • Setup: Large swimming areas with smooth décor and powerful filtration
    • Perform regular water changes, as goldfish produce significant waste.

    Pairs perfectly with

    • Other Comet Goldfish
    • Shubunkins
    • Common Goldfish
    • Sarasa Comets
    • Suitable pond companions of similar size
    NTA Insight:
    One of the biggest myths in fishkeeping is that goldfish belong in bowls. They don't. Comet Goldfish are powerful swimmers that grow surprisingly large and deserve plenty of space. In a properly filtered aquarium or pond, they become incredibly interactive pets that can live for 10–20 years or even longer. Treat them like a long-term companion rather than a temporary pet, and they'll reward you with years of enjoyment.

    FAQ

    How big do Comet Goldfish grow?

    Most Comet Goldfish reach 25–30 cm in home aquariums, with some pond fish growing even larger under ideal conditions.

    Can Comet Goldfish live in a bowl?

    No. Bowls do not provide enough swimming space, filtration or stable water quality. Comets require large aquariums or outdoor ponds to thrive.

    Do Comet Goldfish need a heater?

    Generally no. Comets are coldwater fish and are well suited to the temperatures experienced in most Australian homes. Avoid sudden temperature fluctuations.

    How long do Comet Goldfish live?

    With proper care, good filtration and a suitable environment, Comet Goldfish commonly live 10–20 years, with some individuals living even longer.

    Can I keep Comet Goldfish with tropical fish?

    It's generally not recommended. Comets prefer cooler water and have different dietary and environmental requirements than most tropical species. They are best kept with other single-tail goldfish or compatible pond fish.

    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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