Corydoras spp. C91

Description

Corydoras spp. C91

A rare and highly sought-after collector's Corydoras identified by its C-number. Corydoras C91 combines beautiful natural markings, peaceful schooling behaviour and the charm that has made Corydoras one of the world's favourite freshwater catfish.

Quick Facts

  • Scientific name: Corydoras sp. C91
  • Common name: Corydoras C91
  • Adult size: Approximately 5–6 cm
  • Tank size: 75L+ recommended
  • Difficulty: 🟡 Intermediate
  • Temperament: Extremely peaceful
  • Best kept: Groups of 6 or more

What does "C91" mean?

Many Corydoras enter the aquarium hobby before they receive an official scientific description. These fish are assigned a C-number, allowing hobbyists and collectors to accurately identify and trade them until formal classification occurs. C91 is one of these recognised collector forms. :contentReference[oaicite:0]{index=0}

Is this for you?

✔️ Perfect if:

  • You collect rare Corydoras species.
  • You maintain a mature planted aquarium.
  • You appreciate unusual South American catfish.
  • You enjoy peaceful schooling fish.

❌ Avoid if:

  • You keep aggressive or predatory fish.
  • Your aquarium has coarse or sharp gravel.
  • You only intend to keep one Corydoras.
  • Your aquarium is newly established.

Why choose Corydoras C91?

Corydoras C91 is prized by enthusiasts because of its rarity and limited availability within the aquarium hobby. Like many C-number Corydoras, it is primarily sought after by collectors who enjoy maintaining uncommon species that are rarely seen in local fish stores.

Despite its rarity, its care requirements are very similar to most Corydoras. These peaceful catfish spend their day foraging through the substrate with their sensitive barbels, searching for small food particles while interacting constantly with members of their own group.

When maintained in a mature aquarium with clean water and soft sand, Corydoras C91 becomes an active and fascinating bottom-dwelling fish that rewards patient aquarists with natural schooling behaviour.

Benefits

  • Rare collector's Corydoras
  • Peaceful community fish
  • Ideal for planted aquariums
  • Interesting social behaviour
  • Excellent bottom-dwelling companion
  • Long-lived when well cared for

Care made simple

  • Temperature: 22–27°C
  • pH: 6.0–7.5
  • Diet: Premium sinking pellets, Corydoras wafers, frozen bloodworms, blackworms, brine shrimp and live foods
  • Water: Clean, mature, highly oxygenated and well-filtered
  • Setup: Fine sand substrate, driftwood, leaf litter, plants and shaded resting areas
  • Avoid sharp gravel to protect their sensitive barbels.

Pairs perfectly with

  • Harlequin Rasboras
  • Celestial Pearl Danios
  • Peaceful Apistogramma
  • Rainbowfish
  • Cherry and Crystal Shrimp
NTA Insight:
Many of the most desirable Corydoras in the hobby still carry C-numbers because they were introduced to aquarists before receiving formal scientific names. Owning a species like C91 is a little different from keeping common Corydoras—you're preserving a unique bloodline that relatively few hobbyists have the opportunity to experience. As always, they thrive best in groups, so we recommend starting with at least six specimens.

FAQ

What is a C-number?

C-numbers were created by the German aquarium magazine DATZ to identify undescribed Corydoras species entering the aquarium trade. Many have since received scientific names, while others—including C91—are still widely recognised by their C-number. :contentReference[oaicite:1]{index=1}

How many Corydoras C91 should I keep?

Like all Corydoras, they should be kept in groups of at least six. Larger schools of 8–10 or more encourage natural behaviour and reduce stress.

Can they live with shrimp?

Yes. Adult Neocaridina and Caridina shrimp generally coexist well with Corydoras C91. Dense plants and mosses provide excellent shelter for shrimplets.

Do Corydoras C91 eat algae?

No. They are not algae eaters. Although they consume leftover food from the substrate, they require a dedicated diet of quality sinking foods and frozen treats.

Are Corydoras C91 suitable for beginners?

Their care is comparable to many other Corydoras species, but because they are uncommon and often expensive, they're generally better suited to aquarists with a mature, stable aquarium who are comfortable maintaining excellent water quality.

Corydoras spp. C91

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    Description

    Corydoras spp. C91

    A rare and highly sought-after collector's Corydoras identified by its C-number. Corydoras C91 combines beautiful natural markings, peaceful schooling behaviour and the charm that has made Corydoras one of the world's favourite freshwater catfish.

    Quick Facts

    • Scientific name: Corydoras sp. C91
    • Common name: Corydoras C91
    • Adult size: Approximately 5–6 cm
    • Tank size: 75L+ recommended
    • Difficulty: 🟡 Intermediate
    • Temperament: Extremely peaceful
    • Best kept: Groups of 6 or more

    What does "C91" mean?

    Many Corydoras enter the aquarium hobby before they receive an official scientific description. These fish are assigned a C-number, allowing hobbyists and collectors to accurately identify and trade them until formal classification occurs. C91 is one of these recognised collector forms. :contentReference[oaicite:0]{index=0}

    Is this for you?

    ✔️ Perfect if:

    • You collect rare Corydoras species.
    • You maintain a mature planted aquarium.
    • You appreciate unusual South American catfish.
    • You enjoy peaceful schooling fish.

    ❌ Avoid if:

    • You keep aggressive or predatory fish.
    • Your aquarium has coarse or sharp gravel.
    • You only intend to keep one Corydoras.
    • Your aquarium is newly established.

    Why choose Corydoras C91?

    Corydoras C91 is prized by enthusiasts because of its rarity and limited availability within the aquarium hobby. Like many C-number Corydoras, it is primarily sought after by collectors who enjoy maintaining uncommon species that are rarely seen in local fish stores.

    Despite its rarity, its care requirements are very similar to most Corydoras. These peaceful catfish spend their day foraging through the substrate with their sensitive barbels, searching for small food particles while interacting constantly with members of their own group.

    When maintained in a mature aquarium with clean water and soft sand, Corydoras C91 becomes an active and fascinating bottom-dwelling fish that rewards patient aquarists with natural schooling behaviour.

    Benefits

    • Rare collector's Corydoras
    • Peaceful community fish
    • Ideal for planted aquariums
    • Interesting social behaviour
    • Excellent bottom-dwelling companion
    • Long-lived when well cared for

    Care made simple

    • Temperature: 22–27°C
    • pH: 6.0–7.5
    • Diet: Premium sinking pellets, Corydoras wafers, frozen bloodworms, blackworms, brine shrimp and live foods
    • Water: Clean, mature, highly oxygenated and well-filtered
    • Setup: Fine sand substrate, driftwood, leaf litter, plants and shaded resting areas
    • Avoid sharp gravel to protect their sensitive barbels.

    Pairs perfectly with

    • Harlequin Rasboras
    • Celestial Pearl Danios
    • Peaceful Apistogramma
    • Rainbowfish
    • Cherry and Crystal Shrimp
    NTA Insight:
    Many of the most desirable Corydoras in the hobby still carry C-numbers because they were introduced to aquarists before receiving formal scientific names. Owning a species like C91 is a little different from keeping common Corydoras—you're preserving a unique bloodline that relatively few hobbyists have the opportunity to experience. As always, they thrive best in groups, so we recommend starting with at least six specimens.

    FAQ

    What is a C-number?

    C-numbers were created by the German aquarium magazine DATZ to identify undescribed Corydoras species entering the aquarium trade. Many have since received scientific names, while others—including C91—are still widely recognised by their C-number. :contentReference[oaicite:1]{index=1}

    How many Corydoras C91 should I keep?

    Like all Corydoras, they should be kept in groups of at least six. Larger schools of 8–10 or more encourage natural behaviour and reduce stress.

    Can they live with shrimp?

    Yes. Adult Neocaridina and Caridina shrimp generally coexist well with Corydoras C91. Dense plants and mosses provide excellent shelter for shrimplets.

    Do Corydoras C91 eat algae?

    No. They are not algae eaters. Although they consume leftover food from the substrate, they require a dedicated diet of quality sinking foods and frozen treats.

    Are Corydoras C91 suitable for beginners?

    Their care is comparable to many other Corydoras species, but because they are uncommon and often expensive, they're generally better suited to aquarists with a mature, stable aquarium who are comfortable maintaining excellent water quality.

    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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