Silver Dollar 4–6cm

Description

Silver Dollar (Metynnis spp.)

Shimmering, active and unmistakably disc-shaped, Silver Dollars are peaceful South American schooling fish that bring constant movement to larger community aquariums. Their bright metallic body and social behaviour make them especially striking when kept in a proper group with plenty of open swimming space.

Quick Facts

  • Scientific name: Metynnis spp. (commonly sold as Metynnis argenteus or closely related species)
  • Common name: Silver Dollar
  • Origin: South America
  • Adult size: Approximately 15 cm, depending on species
  • Tank size: 280L+ recommended for a proper group
  • Difficulty: 🟒 Easy to Moderate
  • Temperament: Peaceful but active and sometimes skittish
  • Swimming level: Midwater
  • Best kept: Groups of at least 5–6, with larger groups preferred where space allows

Is this for you?

βœ”οΈ Perfect if:

  • You want a larger peaceful schooling fish.
  • You have a spacious aquarium with plenty of open swimming room.
  • You enjoy active midwater fish.
  • You keep medium to large peaceful community species.
  • You prefer a striking metallic silver fish with a classic body shape.

❌ Avoid if:

  • Your aquarium is small.
  • You intend to keep only one or two individuals.
  • You want to maintain a heavily planted display with delicate plants.
  • You keep very small fish that could be intimidated by a large active school.

Why choose Silver Dollars?

Silver Dollars are one of the most recognisable large schooling fish in the aquarium hobby.

Their deep, laterally compressed bodies reflect light beautifully and create a strong metallic silver flash as the group moves through the aquarium.

They are peaceful by nature but are most confident when kept in a proper school. A larger group reduces nervous behaviour and creates a much more natural display.

They are also hardy and adaptable once established, making them an excellent choice for aquarists with the space to accommodate their adult size.

Benefits

  • Striking metallic silver appearance
  • Peaceful temperament
  • Excellent schooling behaviour
  • Hardy once established
  • Active midwater presence
  • Easy to feed
  • Excellent for larger community aquariums

Care made simple

  • Temperature: Approximately 23–28Β°C
  • pH: Approximately 6.0–7.5
  • Water: Clean, stable and well oxygenated
  • Diet: Primarily herbivorous/omnivorous
  • Staple foods: Quality flakes, pellets and vegetable-based foods
  • Supplement with: Spirulina, algae wafers, blanched vegetables and occasional live or frozen foods
  • Flow: Gentle to moderate
  • Setup: Large open swimming areas with secure cover
  • Be aware that Silver Dollars may eat or damage many aquarium plants.
  • Regular water changes help maintain strong condition and reduce stress.

Pairs perfectly with

  • Peaceful medium to large cichlids
  • Plecos
  • Larger Corydoras and catfish
  • Other peaceful medium-sized community fish
  • Other Silver Dollars
NTA Insight:
Silver Dollars are schooling fish, so one or two individuals can appear nervous and skittish. A proper group of five or six or more produces much better behaviour and a more impressive display. Also expect them to treat many soft aquarium plants as food.

FAQ

What is the scientific name of the Silver Dollar?

Several closely related Metynnis species are sold under the common name Silver Dollar. The common form is often identified as Metynnis argenteus, but trade identification can vary, so this listing is conservatively identified as Metynnis spp.

How large do Silver Dollars grow?

Most common Silver Dollars reach approximately 15 cm as adults, although final size varies somewhat between species.

How many Silver Dollars should I keep?

Keep at least five to six individuals, with a larger school preferred where aquarium size allows.

Are Silver Dollars peaceful?

Yes. They are generally peaceful schooling fish, although their size and active swimming style mean they are better suited to medium and large community aquariums.

Do Silver Dollars eat plants?

Often, yes. They are strongly herbivorous and may eat or damage many live aquarium plants.

What should I feed them?

Offer quality flakes or pellets with plenty of vegetable matter, including spirulina-based foods, algae wafers and suitable blanched vegetables. Occasional live or frozen foods can also be offered.

Do Silver Dollars need a heater?

In most Australian homes a heater is recommended to maintain a stable tropical temperature, particularly through cooler months.

Are Silver Dollars suitable for beginners?

They are hardy and straightforward to feed, but their adult size and need for a proper school mean they require a large, well-established aquarium.

How long do Silver Dollars live?

With good care, Silver Dollars can live for around 10 years or more.

Silver Dollar 4–6cm

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Free pickup in our shop(s)

SKU: 25015

πŸ“ In-Store Locations: OFFLOCATION1
πŸ“¦ Arrival Date: 14 August 2026

5 in stock  

$19.95


All prices include GST
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    Description

    Silver Dollar (Metynnis spp.)

    Shimmering, active and unmistakably disc-shaped, Silver Dollars are peaceful South American schooling fish that bring constant movement to larger community aquariums. Their bright metallic body and social behaviour make them especially striking when kept in a proper group with plenty of open swimming space.

    Quick Facts

    • Scientific name: Metynnis spp. (commonly sold as Metynnis argenteus or closely related species)
    • Common name: Silver Dollar
    • Origin: South America
    • Adult size: Approximately 15 cm, depending on species
    • Tank size: 280L+ recommended for a proper group
    • Difficulty: 🟒 Easy to Moderate
    • Temperament: Peaceful but active and sometimes skittish
    • Swimming level: Midwater
    • Best kept: Groups of at least 5–6, with larger groups preferred where space allows

    Is this for you?

    βœ”οΈ Perfect if:

    • You want a larger peaceful schooling fish.
    • You have a spacious aquarium with plenty of open swimming room.
    • You enjoy active midwater fish.
    • You keep medium to large peaceful community species.
    • You prefer a striking metallic silver fish with a classic body shape.

    ❌ Avoid if:

    • Your aquarium is small.
    • You intend to keep only one or two individuals.
    • You want to maintain a heavily planted display with delicate plants.
    • You keep very small fish that could be intimidated by a large active school.

    Why choose Silver Dollars?

    Silver Dollars are one of the most recognisable large schooling fish in the aquarium hobby.

    Their deep, laterally compressed bodies reflect light beautifully and create a strong metallic silver flash as the group moves through the aquarium.

    They are peaceful by nature but are most confident when kept in a proper school. A larger group reduces nervous behaviour and creates a much more natural display.

    They are also hardy and adaptable once established, making them an excellent choice for aquarists with the space to accommodate their adult size.

    Benefits

    • Striking metallic silver appearance
    • Peaceful temperament
    • Excellent schooling behaviour
    • Hardy once established
    • Active midwater presence
    • Easy to feed
    • Excellent for larger community aquariums

    Care made simple

    • Temperature: Approximately 23–28Β°C
    • pH: Approximately 6.0–7.5
    • Water: Clean, stable and well oxygenated
    • Diet: Primarily herbivorous/omnivorous
    • Staple foods: Quality flakes, pellets and vegetable-based foods
    • Supplement with: Spirulina, algae wafers, blanched vegetables and occasional live or frozen foods
    • Flow: Gentle to moderate
    • Setup: Large open swimming areas with secure cover
    • Be aware that Silver Dollars may eat or damage many aquarium plants.
    • Regular water changes help maintain strong condition and reduce stress.

    Pairs perfectly with

    • Peaceful medium to large cichlids
    • Plecos
    • Larger Corydoras and catfish
    • Other peaceful medium-sized community fish
    • Other Silver Dollars
    NTA Insight:
    Silver Dollars are schooling fish, so one or two individuals can appear nervous and skittish. A proper group of five or six or more produces much better behaviour and a more impressive display. Also expect them to treat many soft aquarium plants as food.

    FAQ

    What is the scientific name of the Silver Dollar?

    Several closely related Metynnis species are sold under the common name Silver Dollar. The common form is often identified as Metynnis argenteus, but trade identification can vary, so this listing is conservatively identified as Metynnis spp.

    How large do Silver Dollars grow?

    Most common Silver Dollars reach approximately 15 cm as adults, although final size varies somewhat between species.

    How many Silver Dollars should I keep?

    Keep at least five to six individuals, with a larger school preferred where aquarium size allows.

    Are Silver Dollars peaceful?

    Yes. They are generally peaceful schooling fish, although their size and active swimming style mean they are better suited to medium and large community aquariums.

    Do Silver Dollars eat plants?

    Often, yes. They are strongly herbivorous and may eat or damage many live aquarium plants.

    What should I feed them?

    Offer quality flakes or pellets with plenty of vegetable matter, including spirulina-based foods, algae wafers and suitable blanched vegetables. Occasional live or frozen foods can also be offered.

    Do Silver Dollars need a heater?

    In most Australian homes a heater is recommended to maintain a stable tropical temperature, particularly through cooler months.

    Are Silver Dollars suitable for beginners?

    They are hardy and straightforward to feed, but their adult size and need for a proper school mean they require a large, well-established aquarium.

    How long do Silver Dollars live?

    With good care, Silver Dollars can live for around 10 years or more.

    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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