Amanda Jane Cory

Quick summary

The Amanda Jane Cory is a striking, peaceful bottom-dweller that works well in community tanks and is suitable for intermediate keepers who can maintain clean, soft water. If you enjoy watching sociable catfish forage together along the substrate, this species will reward you with fascinating group behaviour and bold patterning.

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• Introduction
• Quick stats
• Appearance
• Natural habitat
• Tank size and setup
• Water parameters
• Filtration and equipment
• Diet and feeding
• Behaviour and temperament
• Tank mates
• Breeding
• Common diseases and health
• Frequently asked questions
• Related guides

Introduction

Corydoras amandajanea, commonly known as the Amanda Jane Cory, is one of those species that quietly steals the show in a well-stocked aquarium. First described by Sands in 1995, this catfish hails from the Rio Negro basin in Brazil and has steadily gained popularity among dedicated Corydoras enthusiasts. Its bold spotted patterning, sociable nature, and manageable adult size make it a rewarding species for anyone willing to meet its water quality needs.

People love this fish for a handful of good reasons. It is undeniably attractive, with strong contrast between its creamy base colour and dark markings. Like most Corydoras, it is an active forager that spends its day sifting through the substrate in the company of its group, providing constant low-key entertainment. It is also entirely peaceful, which means it fits into a wide range of community setups without causing compatibility headaches.

That said, the Amanda Jane Cory is best suited to keepers who already have some experience maintaining stable, soft-water aquariums. It is not the most demanding fish in the hobby, but it does require cleaner water and lower hardness than some of the more commonly available Corydoras species. If you have kept other Corydoras successfully and are looking for something a little more unusual, this is a fantastic next step.

Appearance

The Amanda Jane Cory is a handsome fish with a cream to pale gold body covered in large, well-defined dark spots and blotches that extend across the flanks, head, and into the dorsal and caudal fins. The dorsal fin often features a prominent dark blotch near the leading edge, which is one of the visual cues that help distinguish this species from similar-looking Corydoras. The overall effect is bold and graphic, giving this small catfish a presence that belies its modest size. The belly is typically lighter and largely unmarked, creating a clean contrast with the patterned upper body.

Sexing the Amanda Jane Cory follows the general Corydoras pattern. Females tend to be slightly larger and noticeably rounder when viewed from above, particularly when carrying eggs. Males are a touch slimmer and may appear marginally smaller overall. The differences are subtle outside of breeding condition, so keeping a group of six or more gives you the best chance of ending up with both sexes. Colour intensity can vary slightly between individuals, but there are no distinct colour morphs in the hobby at present.

Natural habitat

Corydoras amandajanea is found in tributaries of the upper Rio Negro system in the Brazilian Amazon. The Rio Negro is famous for its dark, tea-stained waters, coloured by tannins leached from decomposing plant material on the forest floor. These blackwater environments are characterised by extremely soft, acidic water with minimal dissolved minerals. The substrate in these habitats is typically fine sand mixed with leaf litter, fallen branches, and submerged roots, offering plenty of shelter and foraging opportunities for bottom-dwelling species.

Understanding this natural habitat matters because it tells you a lot about what this fish needs in captivity. The Amanda Jane Cory has evolved in warm, soft, acidic water with low light penetration and a soft, non-abrasive substrate. Replicating even a rough approximation of these conditions, soft water, sandy substrate, some leaf litter and driftwood, will go a long way toward keeping this species healthy and showing its best colour. Fish kept in hard, alkaline water often appear washed out and are more prone to stress-related illness.

Tank size and setup

A group of six Amanda Jane Corys should be kept in a tank of at least 80 litres. If you want a larger group or plan to keep them in a community setting with other species, aim for 120 litres or more. The footprint of the tank matters more than height for bottom-dwelling fish, so a standard rectangular aquarium with plenty of floor space is ideal.

Substrate choice is critical for all Corydoras, and the Amanda Jane Cory is no exception. Use a fine, smooth sand such as play sand, pool filter sand, or a specialist aquarium sand like JBL Sansibar or ADA La Plata Sand. Avoid coarse gravel or sharp substrates that can damage the barbels these fish rely on for foraging. A thin layer of dried Indian almond leaves (Terminalia catappa) or oak leaves scattered across the sand adds a natural look and releases tannins that soften the water gently.

For planting, choose species that do well in soft, slightly acidic water and lower light levels. Java fern (Microsorum pteropus), Anubias barteri, Cryptocoryne wendtii, and floating plants like Amazon frogbit (Limnobium laevigatum) all work beautifully. Floating plants are especially useful because they diffuse light and provide a sense of cover. Add a few pieces of driftwood, such as Malaysian driftwood or spider wood, along with some smooth river stones to create hiding spots and visual interest. Keep the lighting subdued or use floating plants to break it up, as this species is most active and confident under dimmer conditions. Water flow should be gentle to moderate, mimicking the slow-moving tributaries these fish inhabit in the wild.

Water parameters

The Amanda Jane Cory is a soft-water species, and this is probably the single most important thing to get right. If your tap water is naturally hard and alkaline, you will likely need to use RO (reverse osmosis) water remineralised with a product like Seachem Equilibrium to hit the right range. Consistency matters even more than hitting an exact number, so avoid large swings in pH or hardness between water changes. Weekly water changes of 20 to 30 percent are a good baseline, using temperature-matched and dechlorinated water. Keep nitrates as low as practical, ideally well under 20 ppm, since elevated nitrates can cause barbel erosion and general stress in Corydoras.

Filtration and equipment

A good quality filter that turns the tank volume over four to six times per hour is ideal. Sponge filters are a popular choice for Corydoras tanks because they provide gentle flow, excellent biological filtration, and no risk of trapping small fry if you plan to breed. For larger community tanks, a canister filter such as the Fluval 207 or Eheim Classic 250 works well, paired with a spray bar or lily pipe to diffuse the output and avoid creating a strong current. If you notice your Corydoras constantly swimming against the flow rather than foraging, reduce the output or redirect it.

A reliable heater is essential. An adjustable heater rated for your tank size, such as the Eheim Jager or Fluval E-series, will allow you to dial in the 24 to 28 °C range precisely. Use a separate thermometer to verify the temperature rather than relying solely on the heater dial. For water testing, an API Freshwater Master Test Kit is the most cost-effective option for monitoring ammonia, nitrite, nitrate, and pH. A GH/KH test kit is also useful given this species’ sensitivity to hardness levels.

Diet and feeding

In the wild, Corydoras amandajanea feeds on small invertebrates, insect larvae, worms, and organic detritus found in and on the substrate. In captivity, they are not fussy eaters, but a varied diet will keep them in the best condition and encourage natural foraging behaviour.

A high-quality sinking pellet or wafer should form the staple of their diet. Hikari Sinking Wafers, Sera Vipagran, or Northfin Kelp Wafers are all solid choices. Supplement these regularly with frozen or live foods such as bloodworm, daphnia, brine shrimp, and tubifex. Live foods in particular are excellent for conditioning fish for breeding. Blanched vegetables like courgette (zucchini) or cucumber slices can be offered occasionally and are usually accepted with enthusiasm.

Feed once or twice a day, offering only as much as the group can consume within a few minutes. Corydoras are sometimes out-competed by faster midwater fish, so it helps to feed after lights out or to target food directly to the substrate near the group. Uneaten food should be removed promptly to maintain water quality.

Behaviour and temperament

The Amanda Jane Cory is a quintessential Corydoras in terms of behaviour. It is gregarious, peaceful, and most active when kept in a group of six or more. In smaller numbers, these fish tend to be shy and spend most of their time hiding. In a proper school, they gain confidence and spend their days foraging across the substrate in a loose group, occasionally breaking away to investigate a particular corner before rejoining their companions.

One of the most endearing traits of Corydoras is their “winking” behaviour, which is actually the fish rotating its eye. They also dart to the surface periodically to gulp air, which is completely normal. Corydoras possess a modified intestine that allows them to absorb atmospheric oxygen, and they use this ability even when dissolved oxygen levels in the tank are perfectly adequate. If you see this happening very frequently, though, it may be worth checking your water quality and aeration. These fish are primarily crepuscular, meaning they are most active during dawn and dusk, but in a comfortable, dimly lit tank they will forage throughout the day.

Tank mates

Good tank mates

• Cardinal Tetra (Paracheirodon axelrodi), thrives in the same soft, acidic water and occupies the mid to upper water column
• Rummy Nose Tetra (Hemigrammus rhodostomus), another Rio Negro species with matching water requirements and a peaceful nature
• Ember Tetra (Hyphessobrycon amandae), tiny and gentle, stays in the mid-water and will not compete for food on the substrate
• Otocinclus (Otocinclus vittatus), peaceful algae eater that shares the preference for soft water and gentle flow
• Pencilfish (Nannostomus spp.), calm surface-to-mid dwellers that pair beautifully with Corydoras in blackwater setups
• Chocolate Gourami (Sphaerichthys osphromenoides), a soft-water species that is shy and peaceful, a good upper-level companion
• Kuhli Loach (Pangio kuhlii), another gentle bottom dweller, though ensure there is enough floor space for both species

Fish to avoid

• African Cichlids, require hard, alkaline water and are far too aggressive for peaceful Corydoras
• Common Pleco (Hypostomus plecostomus), grows far too large and can be territorial over substrate territory
• Tiger Barb (Puntigrus tetrazona), known fin nipper that can stress bottom dwellers, especially in small groups
• Green Terror (Andinoacara rivulatus), large and aggressive cichlid that will harass or eat small Corydoras
• Red Tail Catfish (Phractocephalus hemioliopterus), a predatory giant that will simply eat tank mates this size

Breeding

Breeding the Amanda Jane Cory follows the general Corydoras pattern, but it can be somewhat challenging compared to more prolific species like Corydoras paleatus or Corydoras aeneus. Start by establishing a well-conditioned group of at least six individuals in a dedicated breeding tank or a quiet section of the main tank. Sexing is easiest when the fish are well-fed and in good condition, as females will appear noticeably rounder when viewed from above.

Conditioning involves feeding a protein-rich diet of live or frozen bloodworm, brine shrimp, and daphnia for two to three weeks. When the females are plump with eggs, simulate the onset of the rainy season by performing a large, cool water change of around 30 to 50 percent using slightly cooler water (2 to 3 °C below the tank temperature). A slight drop in barometric pressure can also act as a trigger. Spawning typically occurs within hours of the water change and involves the classic Corydoras “T-position,” where the male clasps the female’s barbels while she cups a small number of eggs in her pelvic fins.

The female will deposit adhesive eggs on smooth surfaces such as the tank glass, broad plant leaves, or decorations. A typical spawn produces 30 to 80 eggs. It is best to remove the adults or transfer the eggs to a separate hatching container to prevent predation. A small, aerated container with a few drops of methylene blue to prevent fungus works well. Eggs typically hatch in four to five days at around 26 °C. The fry are tiny and will absorb their yolk sac for the first day or two before needing food. Start with infusoria or commercially prepared fry food such as Hikari First Bites, then transition to newly hatched brine shrimp (Artemia nauplii) after a few days. Keep the fry tank scrupulously clean with small daily water changes.

Common diseases and health

Like all Corydoras, the Amanda Jane Cory is susceptible to barbel erosion, a condition where the sensory barbels around the mouth become shortened, frayed, or worn away. This is almost always caused by rough substrate, poor water quality, or bacterial infection in dirty substrate. Prevention is straightforward: use fine sand, keep nitrates low, and perform regular water changes. If barbel erosion does occur, improving water quality and substrate conditions usually allows regrowth over time.

Ich (white spot disease) is another common issue, especially in newly acquired or stressed fish. It presents as small white cysts scattered across the body and fins. Treatment with a half-dose of an ich medication containing malachite green or with raised temperatures (28 to 30 °C over several days) is effective, but note that Corydoras are sensitive to many medications, particularly those containing copper. Always use a reduced dose and monitor closely. Seachem ParaGuard is a relatively safe option for scaleless and armoured catfish.

Bacterial infections can occur in tanks with poor husbandry, manifesting as reddening of the skin, lethargy, clamped fins, or loss of appetite. Broad-spectrum antibacterial treatments such as eSHa 2000 or API Furan-2 can help, but the underlying water quality issue must be addressed to prevent recurrence. Always quarantine new fish for at least two weeks before adding them to an established tank. A simple 20 to 40 litre quarantine tank with a sponge filter, heater, and a few hiding spots is all you need. This small investment of time and effort can save your existing stock from disease introductions.

Frequently asked questions

How many Amanda Jane Corys should I keep together?

A minimum of six is recommended, and more is always better. Corydoras are shoaling fish that feel secure and display natural behaviour only when kept in a group. In smaller numbers they tend to hide, eat less, and show signs of chronic stress. If your tank allows it, a group of eight to ten is ideal.

Can Amanda Jane Corys live in hard water?

They can survive in moderately hard water for a time, but they will not thrive long-term. This species evolved in very soft, acidic blackwater, and keeping it in hard, alkaline conditions often leads to washed-out colouration, reduced lifespan, and difficulty breeding. If your tap water is hard, consider using RO water blended with tap water to bring hardness down to an appropriate level.

Are Amanda Jane Corys good for beginners?

They are best described as an intermediate-level species. While their care is not drastically different from other Corydoras, their need for soft, acidic water and their relative rarity mean they are better suited to keepers who already have experience maintaining stable water parameters. If you are new to fishkeeping, starting with Corydoras paleatus or Corydoras aeneus will teach you the basics of Corydoras care before stepping up to this species.

Why do my Amanda Jane Corys keep darting to the surface?

Occasional trips to the surface to gulp air are completely normal for all Corydoras. They have a specialised section of intestine that can absorb atmospheric oxygen. However, if this behaviour becomes very frequent, almost frantic, it may indicate low dissolved oxygen or poor water quality. Check your water parameters, increase surface agitation, and ensure the tank is not overstocked.

What substrate is best for Amanda Jane Corys?

Fine, smooth sand is the only substrate you should use. These fish spend almost all their time sifting through the substrate with their sensitive barbels, and coarse or sharp materials will cause barbel erosion and discomfort. Play sand, pool filter sand, or aquarium-specific sands like JBL Sansibar are excellent choices. Avoid gravel, crushed coral, and any substrate with rough edges.

Related guides

• Amanda Jane Cory breeding guide
• Amanda Jane Cory tank setup and equipment guide
• Amanda Jane Cory diet and feeding guide
• Best tank mates for Amanda Jane Cory
• Amanda Jane Cory diseases and health guide
• Why is my Amanda Jane Cory losing colour?
• Back to the fish species directory
• Beginner’s guide to cycling your tank