Rust Corydoras (Corydoras rabauti)
A velvety rust-and-black cory that forms lively, tight-knit schools and stays small enough for almost any community tank.
Will it live with a Rust Corydoras?
We compare each fish against your rust corydoras on temperament, size, water parameters and swimming zone. Set your tank size and filter the results.
- Adolf's Cory✅ CompatiblePeaceful · 5.5 cm · Medium care · 22–26 °C (72–79 °F)
- Both are peaceful, and their water overlaps around 23–26 °C — no size, zone or temperament conflicts.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Keep Rust Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Keep Adolf's Cory in a shoal of 6+ or it gets stressed and nippy.
- Agassiz's Corydoras✅ CompatiblePeaceful · 6 cm · Easy care · 22–28 °C (72–82 °F)
- Compatible on the things that matter: shared water near 23–27 °C, workable temperaments, and no predator-and-prey size gap.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Keep Rust Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Keep Agassiz's Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Black Skirt Tetra✅ CompatibleSemi-aggressive · 6 cm · Easy care · 20–26 °C (68–79 °F)
- Peaceful + Semi-aggressive, but with no direct clash here, and their water overlaps around 23–26 °C — no size, zone or temperament conflicts.
- Keep Rust Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Keep Black Skirt Tetra in a shoal of 6+ or it gets stressed and nippy.
- Blackline Rasbora✅ CompatiblePeaceful · 6 cm · Easy care · 22–28 °C (72–82 °F)
- Both are peaceful, and their water overlaps around 23–27 °C — no size, zone or temperament conflicts.
- Keep Rust Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Keep Blackline Rasbora in a shoal of 6+ or it gets stressed and nippy.
- Blood Red Tiger Pleco✅ CompatiblePeaceful · 6 cm · Medium care · 24–29 °C (75–84 °F)
- Compatible on the things that matter: shared water near 24–27 °C, workable temperaments, and no predator-and-prey size gap.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Keep Rust Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Bloodfin Tetra✅ CompatiblePeaceful · 5.5 cm · Easy care · 18–28 °C (64–82 °F)
- Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Keep Rust Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Keep Bloodfin Tetra in a shoal of 6+ or it gets stressed and nippy.
- Butterfly Hillstream Loach✅ CompatiblePeaceful · 6 cm · Hard care · 18–24 °C (64–75 °F)
- Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Keep Rust Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Desert Goby✅ CompatibleSemi-aggressive · 6 cm · Easy care · 18–28 °C (64–82 °F)
- Peaceful + Semi-aggressive, but with no direct clash here, and their water overlaps around 23–27 °C — no size, zone or temperament conflicts.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Keep Rust Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Diamond Tetra✅ CompatiblePeaceful · 6 cm · Easy care · 22–28 °C (72–82 °F)
- Compatible on the things that matter: shared water near 23–27 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Rust Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Keep Diamond Tetra in a shoal of 6+ or it gets stressed and nippy.
- Duplicareus Corydoras✅ CompatiblePeaceful · 5.5 cm · Medium care · 23–27 °C (73–81 °F)
- Compatible on the things that matter: shared water near 23–27 °C, workable temperaments, and no predator-and-prey size gap.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Keep Rust Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Keep Duplicareus Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Eastern Betta✅ CompatibleSemi-aggressive · 6 cm · Medium care · 24–28 °C (75–82 °F)
- Peaceful + Semi-aggressive, but with no direct clash here; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Keep Rust Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Elegant Cory✅ CompatiblePeaceful · 6 cm · Easy care · 22–28 °C (72–82 °F)
- Compatible on the things that matter: shared water near 23–27 °C, workable temperaments, and no predator-and-prey size gap.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Keep Rust Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Keep Elegant Cory in a shoal of 6+ or it gets stressed and nippy.
- False Julii Corydoras✅ CompatiblePeaceful · 6 cm · Easy care · 22–26 °C (72–79 °F)
- Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Keep Rust Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Keep False Julii Corydoras in a shoal of 6+ or it gets stressed and nippy.
- German Blue Ram✅ CompatiblePeaceful · 6 cm · Hard care · 27–30 °C (81–86 °F)
- Compatible on the things that matter: shared water near 27–27 °C, workable temperaments, and no predator-and-prey size gap.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Keep Rust Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Glass Bloodfin Tetra✅ CompatiblePeaceful · 6 cm · Easy care · 22–28 °C (72–82 °F)
- Compatible on the things that matter: shared water near 23–27 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Rust Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Keep Glass Bloodfin Tetra in a shoal of 6+ or it gets stressed and nippy.
- GloFish Tetra✅ CompatibleSemi-aggressive · 6 cm · Easy care · 21–28 °C (70–82 °F)
- Compatible on the things that matter: shared water near 23–27 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Rust Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Keep GloFish Tetra in a shoal of 6+ or it gets stressed and nippy.
- Guppy✅ CompatiblePeaceful · 6 cm · Easy care · 22–28 °C (72–82 °F)
- Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Keep Rust Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Hillstream Loach✅ CompatiblePeaceful · 6 cm · Hard care · 20–24 °C (68–75 °F)
- Both are peaceful, and their water overlaps around 23–24 °C — no size, zone or temperament conflicts.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Keep Rust Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Narcissus II Cory✅ CompatiblePeaceful · 5.5 cm · Medium care · 22–26 °C (72–79 °F)
- Compatible on the things that matter: shared water near 23–26 °C, workable temperaments, and no predator-and-prey size gap.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Keep Rust Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Keep Narcissus II Cory in a shoal of 6+ or it gets stressed and nippy.
- Neon Dwarf Rainbowfish✅ CompatiblePeaceful · 6 cm · Easy care · 23–27 °C (73–81 °F)
- Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Keep Rust Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Keep Neon Dwarf Rainbowfish in a shoal of 6+ or it gets stressed and nippy.
- Odessa Barb✅ CompatibleSemi-aggressive · 6 cm · Easy care · 20–26 °C (68–79 °F)
- Peaceful + Semi-aggressive, but with no direct clash here; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Keep Rust Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Keep Odessa Barb in a shoal of 6+ or it gets stressed and nippy.
- Panda Loach✅ CompatiblePeaceful · 6 cm · Hard care · 18–23 °C (64–73 °F)
- Compatible on the things that matter: shared water near 23–23 °C, workable temperaments, and no predator-and-prey size gap.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Keep Rust Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Peaceful Betta✅ CompatibleSemi-aggressive · 6 cm · Medium care · 24–28 °C (75–82 °F)
- Peaceful + Semi-aggressive, but with no direct clash here, and their water overlaps around 24–27 °C — no size, zone or temperament conflicts.
- Keep Rust Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Pearl Danio✅ CompatiblePeaceful · 6 cm · Easy care · 20–25 °C (68–77 °F)
- Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Keep Rust Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Keep Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- African Butterfly Cichlid⚠️ With cautionSemi-aggressive · 8 cm · Medium care · 22–28 °C (72–82 °F)
- Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
- Keep Rust Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Amano Shrimp⚠️ With cautionPeaceful · 5 cm · Easy care · 18–28 °C (64–82 °F)
- Rust Corydoras may eat Amano Shrimp or pick off its shrimplets — a densely planted tank with moss gives them a fighting chance.
- Keep Rust Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Amazon Puffer⚠️ With cautionPeaceful · 8 cm · Medium care · 23–28 °C (73–82 °F)
- Your 75 L tank is below the ~120 L this pairing really wants — crowding raises aggression.
- Keep Rust Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Keep Amazon Puffer in a shoal of 6+ or it gets stressed and nippy.
- Ash Lipped Apisto⚠️ With cautionSemi-aggressive · 7 cm · Hard care · 24–29 °C (75–84 °F)
- Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
- Keep Rust Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Black Ruby Barb⚠️ With cautionSemi-aggressive · 6 cm · Easy care · 22–26 °C (72–79 °F)
- Your 75 L tank is below the ~100 L this pairing really wants — crowding raises aggression.
- Keep Rust Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Keep Black Ruby Barb in a shoal of 6+ or it gets stressed and nippy.
- Bleeding Heart Tetra⚠️ With cautionSemi-aggressive · 7 cm · Medium care · 23–28 °C (73–82 °F)
- Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
- Keep Rust Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Keep Bleeding Heart Tetra in a shoal of 6+ or it gets stressed and nippy.
- Bright Diamond Tetra⚠️ With cautionPeaceful · 7 cm · Hard care · 24–28 °C (75–82 °F)
- Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
- Keep Rust Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Keep Bright Diamond Tetra in a shoal of 8+ or it gets stressed and nippy.
- Buenos Aires Tetra⚠️ With cautionSemi-aggressive · 7 cm · Easy care · 18–26 °C (64–79 °F)
- Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
- Keep Rust Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Keep Buenos Aires Tetra in a shoal of 6+ or it gets stressed and nippy.
- Colombian Tetra⚠️ With cautionSemi-aggressive · 6.5 cm · Easy care · 24–28 °C (75–82 °F)
- Your 75 L tank is below the ~114 L this pairing really wants — crowding raises aggression.
- Keep Rust Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Keep Colombian Tetra in a shoal of 6+ or it gets stressed and nippy.
- Dwarf Chain Loach⚠️ With cautionPeaceful · 6 cm · Medium care · 24–29 °C (75–84 °F)
- Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
- Keep Rust Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Keep Dwarf Chain Loach in a shoal of 6+ or it gets stressed and nippy.
- Ghost Shrimp⚠️ With cautionPeaceful · 4 cm · Easy care · 18–28 °C (64–82 °F)
- Adult Ghost Shrimp might survive with Rust Corydoras, but expect the young to be eaten — plant heavily.
- Keep Rust Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Keep Ghost Shrimp in a shoal of 6+ or it gets stressed and nippy.
- Humpbacked Tetra⚠️ With cautionSemi-aggressive · 5 cm · Hard care · 24–28 °C (75–82 °F)
- Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
- Keep Rust Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Keep Humpbacked Tetra in a shoal of 8+ or it gets stressed and nippy.
- Melon Barb⚠️ With cautionPeaceful · 7 cm · Easy care · 22–28 °C (72–82 °F)
- Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
- Keep Rust Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Keep Melon Barb in a shoal of 8+ or it gets stressed and nippy.
- Morse Code Corydoras⚠️ With cautionPeaceful · 5 cm · Medium care · 23–26 °C (73–79 °F)
- Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
- Keep Rust Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Keep Morse Code Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Rounded Filament Barb⚠️ With cautionPeaceful · 7 cm · Medium care · 22–27 °C (72–81 °F)
- Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
- Keep Rust Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Keep Rounded Filament Barb in a shoal of 6+ or it gets stressed and nippy.
- Tiger Barb⚠️ With cautionSemi-aggressive · 7 cm · Easy care · 22–28 °C (72–82 °F)
- Your 75 L tank is below the ~95 L this pairing really wants — crowding raises aggression.
- Keep Rust Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Keep Tiger Barb in a shoal of 6+ or it gets stressed and nippy.
- Discus⛔ Not recommendedPeaceful · 20 cm · Hard care · 28–31 °C (82–88 °F)
- Temperature needs don't overlap (Rust Corydoras 23–27 °C vs Discus 28–31 °C).
- Your 75 L tank is below the ~200 L this pairing really wants — crowding raises aggression.
- Keep Rust Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Keep Discus in a shoal of 6+ or it gets stressed and nippy.
- Goldfish⛔ Not recommendedPeaceful · 30 cm · Medium care · 18–22 °C (64–72 °F)
- Temperature needs don't overlap (Rust Corydoras 23–27 °C vs Goldfish 18–22 °C).
- Goldfish may bully the smaller Rust Corydoras, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
- Your 75 L tank is below the ~150 L this pairing really wants — crowding raises aggression.
- Keep Rust Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Imperial Flower Loach⛔ Not recommendedSemi-aggressive · 50 cm · Hard care · 15–22 °C (59–72 °F)
- Temperature needs don't overlap (Rust Corydoras 23–27 °C vs Imperial Flower Loach 15–22 °C).
- Imperial Flower Loach may bully the smaller Rust Corydoras, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
- Your 75 L tank is below the ~750 L this pairing really wants — crowding raises aggression.
- Keep Rust Corydoras in a shoal of 6+ or it gets stressed and nippy.
Compatibility is computed from each species' care data — a strong starting point, not a guarantee. Individual temperament varies, so always introduce new fish slowly and watch them.
Rust Corydoras care specs
- Care level
- Easy
- Breeding
- Medium
- Max size
- 5.5 cm (2.2 in)
- Min tank size
- 60 L (15.9 gal)
- Temperature
- 23–27 °C (73–81 °F)
- pH
- 6–7.5
- Hardness
- 2–12 dGH
- Lifespan
- 4–7 years
- Diet
- Omnivore
- Swim level
- Bottom
- Group size
- 6+ (shoaling)
- Family
- Callichthyidae
- Origin
- South America — upper Amazon basin (Brazil, Peru, Colombia)
What is a Rust Corydoras?
The rust corydoras (Corydoras rabauti) is a small armoured catfish from the upper Amazon basin, prized for its clean two-tone pattern: a warm rust-orange body crossed by a bold black stripe from snout through eye to dorsal fin, with a pale cream underside. The result is striking yet subtle enough to complement almost any planted community tank.
At a maximum of 5.5 cm (about 2.2 in), it fits comfortably in a 60 L (16 gal) setup, yet is active enough to be a genuine centrepiece at the bottom of the tank. It shares the industrious, peaceful character of all corydoras: constantly sifting the substrate, occasionally dashing to the surface for a gulp of air, and rarely showing any aggression.
One important trade note: C. rabauti is frequently confused with Corydoras duplicareus, which carries an iridescent golden-metallic patch on the flank just behind the head that C. rabauti lacks. Many fish sold under the rabauti name are actually duplicareus. Care requirements are effectively identical, but if species accuracy matters, inspect that patch before buying.
Where does the rust corydoras come from?
Wild rust corydoras inhabit slow-moving or still forest streams, shallow clearwater creeks and pool margins with sandy or leaf-littered bottoms in the upper Amazon basin — Brazil, Peru and Colombia. Overhanging vegetation keeps light low; the water is soft, often brownish from tannins leached by fallen leaves, and mildly acidic to neutral. Those conditions translate directly into ideal aquarium parameters: fine sand, driftwood or leaf litter, subdued lighting and soft-to-neutral chemistry produce the most confident, naturally behaving fish in captivity.
What tank size and setup does the rust corydoras need?
A school of six rust corydoras fits comfortably in a 60 L (16 gal) tank, though a 75–80 L (20 gal) footprint gives the group more room to roam and makes water quality easier to maintain. Because these are bottom-dwellers, floor space matters more than tank height — a longer, shallower tank outperforms a tall, narrow one of the same volume.
Substrate is the single most important hardware decision. Use fine-grained sand; coarser gravel abrades the sensitive barbels these fish use to sift for food, leading to bacterial infection and permanent barbel loss. Furnish with driftwood, Indian almond leaves or Java fern to create the shaded refuges the school naturally seeks. Filtration should be efficient but gentle — a sponge filter or a canister with a spray-bar return keeps water clean without creating currents that exhaust small cories.
What water parameters do rust corydoras need?
- Temperature: 23–27 °C (73–81 °F). Mid-range values around 24–25 °C suit most community setups.
- pH: 6.0–7.5. Soft-acid conditions in the 6.5–7.0 range are ideal.
- Hardness: 2–12 dGH — soft to moderately hard.
These parameters are forgiving enough for most municipal tap water once dechlorinated, though very hard or alkaline tap water may benefit from mixing with RO water. As with any corydoras, stability is the priority: gradual, consistent conditions reduce stress far more than hitting a precise target. Weekly water changes of 25–30% keep nitrates down and barbel health up — nitrate accumulation is a common but overlooked trigger for barbel erosion.
What do rust corydoras eat?
Rust corydoras are omnivores and genuinely unfussy feeders. A practical staple diet includes:
- Sinking wafers or pellets formulated for bottom-dwellers (Spirulina or catfish tablets are both suitable).
- Frozen or live foods — bloodworm, daphnia, tubifex and brine shrimp — offered a few times per week to maintain condition and encourage breeding behaviour.
- Blanched vegetables — cucumber, zucchini or peas — accepted occasionally and useful for gut diversity.
Feed after lights-out or at dusk, when corydoras are naturally most active, to ensure the food reaches the bottom before faster mid-water fish intercept it. Remove uneaten food within a day to protect water quality. Like all corydoras, they will also graze on leftover food from tank-mates, but do not rely on scavenging as a primary food source — they need targeted feeding to thrive.
What is the rust corydoras’ behaviour and compatibility?
Rust corydoras are fully peaceful and pose no threat to any tank-mate that is not small enough to be swallowed. Equally, they cannot defend themselves against fin-nippers or aggressive mid-water fish. The key compatibility rules are:
- School size: Keep a minimum of six; eight or more is better. A small group hides persistently and shows the stress of isolation. A proper school actively explores the tank throughout the day.
- Tank-mate size: Avoid any fish large enough to eat a 5.5 cm cory. Angels and large cichlids can threaten them.
- Water chemistry alignment: Best matched with other soft-water Amazonian species — small tetras (neons, cardinals, rummies), pencilfish, dwarf cichlids such as apistogramma, rasboras and small livebearers in softer water all work well.
- Bottom space: Do not overstock the bottom layer. Combining rust corydoras with plecos and other substrate species in a small tank leads to competition and territory stress.
For a filterable list of species that have been tested against the rust corydoras’ temperament, size and water needs, see Rust Corydoras tank mates.
How do you tell male and female rust corydoras apart?
Sexing rust corydoras is easiest when viewing a group from above. Females are noticeably rounder and broader-bodied across the belly — the difference becomes pronounced when gravid (carrying eggs). Males are slimmer, more streamlined and typically a little smaller. From the side the difference is subtler in young fish, but a well-conditioned adult female is usually obvious within a group. There are no fin-shape differences as there are in some other catfish genera.
How do rust corydoras breed?
Breeding rust corydoras in captivity is achievable but rated medium difficulty — mainly because conditioning and triggering the spawn requires attention to detail rather than luck.
Conditioning: Feed the group heavily on live or frozen foods for several weeks; a 1:2 male-to-female ratio helps. Triggering: Perform a large (30–40%) water change with slightly cooler water to mimic the onset of the rainy season. Spawning: Females collect sperm in the “T-position” embrace, then press adhesive eggs onto glass or plant leaves — 20–100 eggs per spawn. Raising fry: Move eggs to a separate container with gentle aeration. Eggs hatch in 3–5 days; feed microworms and baby brine shrimp once free-swimming. Adults show no parental care after spawning.
What diseases affect rust corydoras?
Rust corydoras share the common health vulnerabilities of the broader corydoras genus:
- Barbel erosion/infection: The most frequent problem, caused by dirty substrate, coarse gravel or elevated nitrates. Prevention: fine sand, regular water changes and prompt siphoning of detritus.
- Ich (white spot): Classic white-spot parasite, especially in stressed or newly acquired fish. Prevention: quarantine new arrivals 2–4 weeks; maintain stable temperature.
- Red blotch disease: Reddening at the fin bases or belly, linked to poor water quality. Prevention mirrors barbel-erosion care.
- Catfish medication caution: Corydoras can be sensitive to copper-based treatments and high concentrations of malachite green. Always verify label suitability before treating.
Health note: medication dosing and disease diagnosis are beyond the scope of a care profile. For sick fish, confirm symptoms against a reputable veterinary or fish-health source before treating — and fix water quality first, since most rust corydoras illness traces back there.
How long do rust corydoras live?
With good care, rust corydoras live 4–7 years in the aquarium. The lower end of that range tends to apply to fish kept in suboptimal conditions — particularly dirty substrate, incorrect water hardness, or chronic stress from being kept in groups too small. Fish that arrive as juveniles in a well-maintained, sand-bottomed tank with a proper school regularly reach the upper end. Clean water, a stable school of six or more, a varied diet and a fine-grain substrate are the four pillars of a long-lived rust corydoras.
Frequently asked questions
How is Corydoras rabauti different from Corydoras duplicareus?
They look almost identical — both share the rust-and-black stripe pattern. The reliable difference is that C. duplicareus has a metallic sheen (iridescent golden patch) above the stripe just behind the head, while C. rabauti lacks this metallic area. In the trade, many fish sold as C. rabauti are actually C. duplicareus, so look for that iridescent patch when buying.
Do rust corydoras need to be in a group?
Yes — a minimum of six is the standard recommendation, and eight or more produces noticeably more active, confident behaviour. A lone cory or a pair will hide and show stress. Like all corydoras, they are social fish that rely on their schoolmates for security.
What you need to keep a rust corydoras
The baseline is a heated, filtered 60 L+ tank: a reliable heater to hold 23–27 °C (73–81 °F), a gentle filter that won't batter a rust corydoras in the current, and a tight-fitting lid. Cycle the tank fully before adding any fish.
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