Flathead Gudgeon (Philypnodon grandiceps) 2-4cm

Description

Flathead Gudgeon (Philypnodon grandiceps)

Subtle, fascinating and unmistakably Australian, the Flathead Gudgeon is a distinctive native freshwater fish with a broad flattened head, beautifully mottled camouflage and an ambush-predator personality. Rather than relying on bright colours, Philypnodon grandiceps rewards the aquarist with natural behaviour, character and the opportunity to keep one of Australia's genuinely interesting native gudgeons.

Quick Facts

  • Scientific name: Philypnodon grandiceps
  • Common name: Flathead Gudgeon
  • Origin: South-eastern Australia
  • Current size: Approximately 4–7 cm
  • Adult size: Commonly around 8–12 cm, with larger individuals possible
  • Tank size: 80L+ recommended
  • Difficulty: 🟢 Easy to Moderate
  • Temperament: Generally peaceful but predatory towards sufficiently small animals
  • Best kept: Singly or in small groups with appropriately sized tank mates and plenty of cover

Is this for you?

✔️ Perfect if:

  • You want to keep an Australian native freshwater species.
  • You enjoy fish with interesting natural behaviour rather than highly selected colouration.
  • You like bottom-dwelling ambush predators with plenty of personality.
  • You are creating a native Australian or natural-style aquarium.

❌ Avoid if:

  • You keep very small fish or shrimp that could fit into its mouth.
  • You want a colourful schooling fish.
  • Your aquarium has no shelter or bottom structure.
  • You intend to mix it with aggressive or highly competitive tank mates.

Why choose the Flathead Gudgeon?

The Flathead Gudgeon is a fish for aquarists who appreciate behaviour as much as colour. Its broad head, large mouth and mottled brown, olive and grey pattern provide excellent camouflage against rocks, timber and leaf litter.

Rather than constantly swimming through open water, Flathead Gudgeons often remain close to the substrate or structure, carefully watching their surroundings before suddenly moving to investigate food or activity nearby. This sit-and-wait behaviour reflects their natural predatory lifestyle.

Their unusual body shape and distinctly Australian character make them an excellent addition to native displays, particularly aquariums designed to resemble local creeks, rivers and wetlands.

Benefits

  • Australian native freshwater species
  • Distinctive broad, flattened head
  • Beautiful natural camouflage pattern
  • Fascinating ambush-predator behaviour
  • Hardy once established
  • Excellent feature fish for native Australian aquariums

Care made simple

  • Temperature: Approximately 16–26°C
  • pH: Approximately 6.5–8.0
  • Diet: Quality sinking carnivore pellets, frozen bloodworms, brine shrimp, insect larvae, worms and appropriately sized live or frozen foods
  • Water: Clean, stable and well oxygenated
  • Substrate: Fine sand or smooth gravel
  • Setup: Driftwood, smooth rocks, caves, leaf litter and sheltered areas
  • Provide plenty of bottom structure where the fish can rest, hide and establish territories.
  • Choose tank mates carefully—anything sufficiently small may be considered food.

Pairs perfectly with

  • Australian Rainbowfish
  • Larger Blue-eyes
  • Empire Gudgeons
  • Other appropriately sized Australian native fishes
  • Natural aquascapes with driftwood, rocks and native-style planting
NTA Insight:
The Flathead Gudgeon isn't a fish you buy because you want constant colour and movement—it is a fish you keep because you appreciate natural behaviour. Watch one carefully and you'll see an efficient little ambush predator using its camouflage, broad head and surprisingly large mouth exactly as it would in an Australian waterway. Give it structure, cover and appropriately sized food and it becomes a fascinating aquarium resident.

FAQ

Is the Flathead Gudgeon an Australian native?

Yes. Philypnodon grandiceps is native to south-eastern Australia and occurs in a variety of freshwater habitats including rivers, creeks, lakes and wetlands.

How large do Flathead Gudgeons grow?

Many aquarium specimens remain around 8–12 cm, although larger individuals can occur. Their relatively large mouth also means tank mates should be chosen based on body size rather than length alone.

Are Flathead Gudgeons aggressive?

They are not typically aggressive community fish in the conventional sense, but they are predators. Small fish, fry, shrimp and other animals that can fit into their mouth may be eaten.

What should I feed them?

Offer a varied carnivorous diet including quality sinking pellets, frozen bloodworms, insect larvae, worms, brine shrimp and other appropriately sized foods. Newly introduced fish may show a stronger preference for frozen or live foods before accepting prepared diets.

Can Flathead Gudgeons live with shrimp?

They are not recommended for shrimp breeding aquariums. Small shrimp and shrimplets are potential prey, and even larger shrimp may be investigated depending on the size of the gudgeon.

Do Flathead Gudgeons need a heater?

Not necessarily. As an Australian temperate freshwater species, they tolerate cooler conditions than many tropical fish. Stability is more important than maintaining a high tropical temperature, and extreme or rapid temperature changes should be avoided.

Can they be kept in groups?

Yes, provided the aquarium offers sufficient floor space, shelter and visual barriers. Monitor individuals for territorial behaviour and make sure each fish has access to suitable resting and hiding areas.

Can Flathead Gudgeons breed in aquariums?

Yes. They can reproduce in captivity when mature fish are maintained under suitable conditions and provided with appropriate spawning sites. A dedicated breeding setup gives eggs and juveniles the best chance of survival.

Flathead Gudgeon (Philypnodon grandiceps) 2-4cm

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📍 In-Store Locations: B2
📦 Arrival Date: 4 August 2026

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$10.00


All prices include GST
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    Description

    Flathead Gudgeon (Philypnodon grandiceps)

    Subtle, fascinating and unmistakably Australian, the Flathead Gudgeon is a distinctive native freshwater fish with a broad flattened head, beautifully mottled camouflage and an ambush-predator personality. Rather than relying on bright colours, Philypnodon grandiceps rewards the aquarist with natural behaviour, character and the opportunity to keep one of Australia's genuinely interesting native gudgeons.

    Quick Facts

    • Scientific name: Philypnodon grandiceps
    • Common name: Flathead Gudgeon
    • Origin: South-eastern Australia
    • Current size: Approximately 4–7 cm
    • Adult size: Commonly around 8–12 cm, with larger individuals possible
    • Tank size: 80L+ recommended
    • Difficulty: 🟢 Easy to Moderate
    • Temperament: Generally peaceful but predatory towards sufficiently small animals
    • Best kept: Singly or in small groups with appropriately sized tank mates and plenty of cover

    Is this for you?

    ✔️ Perfect if:

    • You want to keep an Australian native freshwater species.
    • You enjoy fish with interesting natural behaviour rather than highly selected colouration.
    • You like bottom-dwelling ambush predators with plenty of personality.
    • You are creating a native Australian or natural-style aquarium.

    ❌ Avoid if:

    • You keep very small fish or shrimp that could fit into its mouth.
    • You want a colourful schooling fish.
    • Your aquarium has no shelter or bottom structure.
    • You intend to mix it with aggressive or highly competitive tank mates.

    Why choose the Flathead Gudgeon?

    The Flathead Gudgeon is a fish for aquarists who appreciate behaviour as much as colour. Its broad head, large mouth and mottled brown, olive and grey pattern provide excellent camouflage against rocks, timber and leaf litter.

    Rather than constantly swimming through open water, Flathead Gudgeons often remain close to the substrate or structure, carefully watching their surroundings before suddenly moving to investigate food or activity nearby. This sit-and-wait behaviour reflects their natural predatory lifestyle.

    Their unusual body shape and distinctly Australian character make them an excellent addition to native displays, particularly aquariums designed to resemble local creeks, rivers and wetlands.

    Benefits

    • Australian native freshwater species
    • Distinctive broad, flattened head
    • Beautiful natural camouflage pattern
    • Fascinating ambush-predator behaviour
    • Hardy once established
    • Excellent feature fish for native Australian aquariums

    Care made simple

    • Temperature: Approximately 16–26°C
    • pH: Approximately 6.5–8.0
    • Diet: Quality sinking carnivore pellets, frozen bloodworms, brine shrimp, insect larvae, worms and appropriately sized live or frozen foods
    • Water: Clean, stable and well oxygenated
    • Substrate: Fine sand or smooth gravel
    • Setup: Driftwood, smooth rocks, caves, leaf litter and sheltered areas
    • Provide plenty of bottom structure where the fish can rest, hide and establish territories.
    • Choose tank mates carefully—anything sufficiently small may be considered food.

    Pairs perfectly with

    • Australian Rainbowfish
    • Larger Blue-eyes
    • Empire Gudgeons
    • Other appropriately sized Australian native fishes
    • Natural aquascapes with driftwood, rocks and native-style planting
    NTA Insight:
    The Flathead Gudgeon isn't a fish you buy because you want constant colour and movement—it is a fish you keep because you appreciate natural behaviour. Watch one carefully and you'll see an efficient little ambush predator using its camouflage, broad head and surprisingly large mouth exactly as it would in an Australian waterway. Give it structure, cover and appropriately sized food and it becomes a fascinating aquarium resident.

    FAQ

    Is the Flathead Gudgeon an Australian native?

    Yes. Philypnodon grandiceps is native to south-eastern Australia and occurs in a variety of freshwater habitats including rivers, creeks, lakes and wetlands.

    How large do Flathead Gudgeons grow?

    Many aquarium specimens remain around 8–12 cm, although larger individuals can occur. Their relatively large mouth also means tank mates should be chosen based on body size rather than length alone.

    Are Flathead Gudgeons aggressive?

    They are not typically aggressive community fish in the conventional sense, but they are predators. Small fish, fry, shrimp and other animals that can fit into their mouth may be eaten.

    What should I feed them?

    Offer a varied carnivorous diet including quality sinking pellets, frozen bloodworms, insect larvae, worms, brine shrimp and other appropriately sized foods. Newly introduced fish may show a stronger preference for frozen or live foods before accepting prepared diets.

    Can Flathead Gudgeons live with shrimp?

    They are not recommended for shrimp breeding aquariums. Small shrimp and shrimplets are potential prey, and even larger shrimp may be investigated depending on the size of the gudgeon.

    Do Flathead Gudgeons need a heater?

    Not necessarily. As an Australian temperate freshwater species, they tolerate cooler conditions than many tropical fish. Stability is more important than maintaining a high tropical temperature, and extreme or rapid temperature changes should be avoided.

    Can they be kept in groups?

    Yes, provided the aquarium offers sufficient floor space, shelter and visual barriers. Monitor individuals for territorial behaviour and make sure each fish has access to suitable resting and hiding areas.

    Can Flathead Gudgeons breed in aquariums?

    Yes. They can reproduce in captivity when mature fish are maintained under suitable conditions and provided with appropriate spawning sites. A dedicated breeding setup gives eggs and juveniles the best chance of survival.

    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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