Black Marble Swordtail

Description

A bold marbled Swordtail with contrasting black-and-light patterning that makes every fish look a little different.

Quick Facts

  • Scientific name: Xiphophorus hellerii
  • Available size: approximately 4.5cm
  • Temperature: 22–28°C
  • pH: around 7.0–8.2
  • Temperament: active and generally peaceful
  • Diet: omnivore
  • Care level: easy to moderate

Is this for you?

Black Marble Swordtails suit aquarists who want a high-contrast livebearer with plenty of movement and natural pattern variation. They work well in appropriately sized community aquariums with compatible tankmates.

Why choose Black Marble Swordtails?

  • Distinctive black-and-light marbled pattern
  • Individual markings vary naturally
  • Active and easy to observe
  • Hardy when kept in stable, well-maintained water

Benefits

The marbled pattern adds strong contrast to planted and darker aquariums, while their active swimming brings movement to the middle and upper water column.

Care made simple

Keep them in stable, well-filtered water with open swimming room, planted or structured cover and a secure lid. Feed a varied omnivorous diet using quality flakes or pellets with appropriate frozen, live or vegetable-based foods. Plan the aquarium around their adult size rather than their juvenile sale size.

Pairs perfectly with

Other robust, peaceful community fish that prefer similar water conditions. Avoid aggressive species or persistent fin nippers.

NTA Insight

Black Marble Swordtails are naturally variable. The amount and placement of black patterning can differ substantially between individuals, so the fish you receive will not be an exact visual copy of the product image.

FAQ

Will every Black Marble Swordtail have the same markings?
No. Pattern distribution varies naturally from fish to fish.

Are they suitable for a community aquarium?
Generally yes, provided tankmates are compatible and there is enough swimming space.

Do they need a lid?
Yes. Swordtails are active fish and a secure lid is recommended.

Black Marble Swordtail

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Free pickup in our shop(s)
📦 Arrival Date: 14 August 2026

 

$9.95


All prices include GST
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    Description

    A bold marbled Swordtail with contrasting black-and-light patterning that makes every fish look a little different.

    Quick Facts

    • Scientific name: Xiphophorus hellerii
    • Available size: approximately 4.5cm
    • Temperature: 22–28°C
    • pH: around 7.0–8.2
    • Temperament: active and generally peaceful
    • Diet: omnivore
    • Care level: easy to moderate

    Is this for you?

    Black Marble Swordtails suit aquarists who want a high-contrast livebearer with plenty of movement and natural pattern variation. They work well in appropriately sized community aquariums with compatible tankmates.

    Why choose Black Marble Swordtails?

    • Distinctive black-and-light marbled pattern
    • Individual markings vary naturally
    • Active and easy to observe
    • Hardy when kept in stable, well-maintained water

    Benefits

    The marbled pattern adds strong contrast to planted and darker aquariums, while their active swimming brings movement to the middle and upper water column.

    Care made simple

    Keep them in stable, well-filtered water with open swimming room, planted or structured cover and a secure lid. Feed a varied omnivorous diet using quality flakes or pellets with appropriate frozen, live or vegetable-based foods. Plan the aquarium around their adult size rather than their juvenile sale size.

    Pairs perfectly with

    Other robust, peaceful community fish that prefer similar water conditions. Avoid aggressive species or persistent fin nippers.

    NTA Insight

    Black Marble Swordtails are naturally variable. The amount and placement of black patterning can differ substantially between individuals, so the fish you receive will not be an exact visual copy of the product image.

    FAQ

    Will every Black Marble Swordtail have the same markings?
    No. Pattern distribution varies naturally from fish to fish.

    Are they suitable for a community aquarium?
    Generally yes, provided tankmates are compatible and there is enough swimming space.

    Do they need a lid?
    Yes. Swordtails are active fish and a secure lid is recommended.

    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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