Albino Bronze Cory (Osteogaster aenea)

Decide whether this social catfish fits your aquarium

The Albino Bronze Cory (Osteogaster aenea) is a pale form of a callichthyid armoured catfish from South America. FishBase places the species from Colombia and Trinidad to the La Plata River basin east of the Andes and records a maximum length of 7.5 cm standard length. It suits a keeper prepared to maintain a proper social group, dedicate enough aquarium floor space and feed the fish directly rather than expecting it to clean up after other inhabitants.

Keep at least five together in an established aquarium with a base of at least 80 × 30 cm. The Seriously Fish profile recommends that footprint or an equivalent, equating it to about 72 litres, while OATA's freshwater-catfish guidance recommends at least 80 litres for a shoal of smaller catfish. Planning around at least 80 litres and the stated base dimensions satisfies both practical benchmarks while leaving the footprint visible as the key long-term measurement.

Keep the water at 22–27°C, pH 6.0–8.0 and 4–15 dGH. These routine values are the overlap of the Seriously Fish aquarium range and OATA's freshwater-catfish group guidance, not a species-specific optimum. Maintain ammonia and nitrite at 0 mg/l and use an established biological filter from the outset.

This is a bottom-oriented, foraging fish rather than a piece of maintenance equipment. Its peaceful temperament makes it a candidate for a community aquarium, but the Cory group, adult size, water range, filter capacity and feeding access all need to be settled before other inhabitants are considered.

Choose the offer by dispatch size, not adult size

Each purchase supplies one Albino Bronze Cory from the size grade chosen on the live selector. The selector includes 2–2.5 cm, 2.5–3 cm, 3–3.5 cm, >3.5 cm and >4 cm grades. Use the grade to choose the dispatch size that fits your stocking plan, but build the aquarium around the recorded adult length of 7.5 cm and the needs of the complete group.

The size you select is the size supplied, not the adult size. A larger dispatch grade does not change the long-term water, group or footprint requirements. Likewise, a smaller grade is not a reason to begin with an aquarium below the long-term recommendation.

Sex is guaranteed only when the selected option explicitly states male or female. This Albino Bronze Cory listing has no sex-guaranteed option. Do not use body shape, colour intensity or a gallery image to choose or predict sex.

The current scientific name is Osteogaster aenea. The older combination Corydoras aeneus remains familiar in aquarium literature, while Albino Corydoras is another established trade name for this selectively bred albino strain. Treat these names as references to the same care subject here, rather than as different species or separate care types.

Some gallery images have been digitally enhanced to improve image quality. They show the listed type of animal rather than guaranteeing the exact markings of the individual supplied, so natural colour and pattern can vary. The gallery is useful for recognising the characteristic pale form, but the offer is defined by the title and live size selector rather than by the appearance of one pictured fish.

If you are comparing this fish with other members of the group, browse the current Corydoras collection. Compare adult length, social requirement, aquarium footprint and water values before deciding; a shared group name does not make every species interchangeable in one aquarium.

Plan the aquarium around the adult group and footprint

Use an aquarium with a base of at least 80 × 30 cm and plan on at least 80 litres for the Cory group. Seriously Fish associates that base with about 72 litres, while OATA's broader recommendation begins at 80 litres for a shoal of smaller catfish. Meeting both the footprint and practical volume target gives the group room to forage while providing more stable temperature and water quality than a smaller body of water.

Prepare and mature the aquarium before adding livestock. Our first tropical aquarium guide explains the setup sequence, while the essential decision here is to have an established biological filter capable of processing the waste created by the complete stocking plan. OATA advises increasing fish numbers slowly because the beneficial bacterial population must grow when fish numbers and feeding increase.

Size the equipment to the aquarium

Seriously Fish recommends filtration turnover of four to five times the aquarium volume per hour. For its example of about 72 litres, that corresponds to a filter rated at roughly 290–360 litres per hour. Applied to an 80-litre aquarium, the same calculation gives 320–400 litres per hour. Use the actual aquarium volume when making the calculation rather than copying the example rating onto a differently sized tank.

The same profile gives a heater reference of roughly 50–75 W for a 72-litre aquarium maintained at 21–27°C in a room around 20°C. The room-temperature assumption matters: select equipment capable of holding the chosen temperature steadily in the room where the aquarium stands.

Plan the complete population

Reserve capacity for at least five Albino Bronze Corys before adding other fish. Extra inhabitants increase waste and may also use the aquarium floor or compete at feeding time. OATA recommends buying an aquarium as large as reasonably possible because larger systems tend to offer more stable environmental conditions. A larger group or a fuller community plan therefore calls for more space and filtration capacity rather than simply fitting more fish into the minimum footprint.

Hold the routine water range and test the waste cycle

Keep the aquarium at 22–27°C, pH 6.0–8.0 and 4–15 dGH. Choose a point within those ranges that also suits every proposed community inhabitant, then use regular testing to catch changes before they become a livestock problem. Our water chemistry guide explains what the main readings mean, and the water matcher helps compare measured aquarium water with these care values.

Maintain ammonia at 0 mg/l and nitrite at 0 mg/l. OATA also advises keeping nitrate no more than 20 mg/l above the normal tap-water level. That wording uses the tap-water result as the baseline: if the tap reads 10 mg/l nitrate, the stated ceiling is 30 mg/l in the aquarium. A result above that difference calls for maintenance and a review of feeding, stocking and filter performance.

Use the nitrogen cycle as the pass-or-fail test

The RSPCA explains why biological filtration is vital: fish waste releases toxic ammonia, beneficial bacteria convert it to nitrite, and another stage converts nitrite to the safer nitrate. A working filter and established bacterial population are therefore part of the life-support system, not optional accessories.

• Ammonia above 0 mg/l: treat the aquarium as failing the care target and check stocking, feeding and biological filtration.
• Nitrite above 0 mg/l: take the same prompt action; the conversion process is not keeping pace with the waste load.
• Rising nitrate: compare it with the tap-water baseline and use the weekly water-change routine to control accumulation.
• Changing temperature or pH: check equipment and replacement-water preparation before making further livestock decisions.

Test at least once per week as part of routine care and test promptly when behaviour, breathing, appearance or feeding changes. Record the results so a trend is visible. A single number shows the aquarium at one moment; repeated results reveal whether filtration and maintenance are keeping pace with the fish population.

Build a soft, open foraging floor with secure cover

Choose fine sand as the ideal substrate. Seriously Fish accepts rounded gravel as an alternative when it is kept scrupulously clean, so substrate shape and maintenance must be considered together. Leave open areas where the group can search for food, and place cover around those spaces rather than filling the entire floor with décor.

FishBase describes the species as benthic and records it mostly in quiet, shallow water with soft bottoms, although it also occurs in running water. That natural history explains why the aquarium floor is central to the setup. It does not require copying a wild locality; it supports giving the fish a clean lower zone where normal searching and resting are easy to observe.

Provide cover without losing usable floor space

Seriously Fish recommends some cover to give the fish security. Plants, suitable wood, pots or caves can create sheltered areas, and OATA notes that many catfish appreciate these forms of refuge. Arrange them so the group can move between open feeding ground and cover without narrow traps or a heavily obstructed base.

Live plants may help create cover. OATA notes that some catfish may eat or dig up live plants and suggests suitable ornaments or artificial plants as alternatives where necessary. Make that choice according to how the aquarium is functioning rather than treating live planting as a fixed requirement.

Keep access to the surface clear

This species is a facultative air-breather. FishBase records intestinal air breathing and surface air-taking as part of its biology, so a direct trip from the aquarium floor to the surface can be normal behaviour. Preserve an open route to the surface and watch for changes in the usual pattern rather than treating every surface visit as a crisis.

Context remains important. A sudden change in breathing, repeated unusual positioning or a wider change in activity belongs with an immediate water test and equipment check. The routine setup decision is simple: maintain clean, filtered water, keep the surface reachable and arrange the floor so the whole group remains visible enough for daily observation.

Feed the Cory group directly instead of relying on leftovers

Use a quality sinking dried food as the staple. Seriously Fish describes Corydoras as foraging omnivores that accept most sinking dried foods, with small live and frozen foods such as bloodworm and Tubifex providing useful variety. Freeze-dried bloodworm is another named option. Choose food that reaches the aquarium floor in a form the group can eat.

FishBase records worms, crustaceans, insects and plant matter in the wild adult diet. That mixed diet supports varied omnivore feeding rather than a single-purpose cleaner diet. Rotate suitable foods while keeping the complete sinking product as the dependable staple.

Use one observed daily feed

OATA advises feeding catfish once a day and giving only what they can eat within a few minutes. Put the food where the Cory group can reach it and remain present long enough to see whether each fish joins the feed. If one area becomes crowded, divide the same measured portion between more than one reachable point rather than increasing the total automatically.

• Food is cleared within a few minutes: the portion is within OATA's feeding window; continue to watch body condition and water results.
• Food remains on the substrate: reduce the next portion and remove the remainder before it breaks down.
• Some fish do not reach food: change placement and observe the community feeding pattern before adding more.
• Interest in food falls: test the water and compare the change with the fish's usual behaviour.

Do not expect the group to survive on leftovers from other inhabitants or rely on it to clean the aquarium. Seriously Fish is explicit on both points. Food missed by other fish is unpredictable in quantity and nutrition, while uneaten material releases waste as it decomposes.

Variety should improve the diet without producing excess food. Alternate the named small live, frozen or freeze-dried choices in modest portions and keep the once-daily, few-minutes limit attached to the total feed. The useful measure is what the fish consume, not how much food reaches the bottom.

Make weekly maintenance consistent and filter-safe

At least once every week, complete a 25% partial water change. OATA pairs that frequency with regular testing, so make the water change, test results and filter check one repeatable routine rather than unrelated jobs completed at different times.

Use the weekly sequence

1. Test ammonia, nitrite and nitrate, and record the results before deciding whether a developing trend needs extra attention.
2. Remove 25% of the aquarium water and use a siphon to lift solid waste from accessible substrate areas.
3. Treat replacement water with tap-water conditioner to remove chlorine or chloramine before adding it to the aquarium.
4. Check the filter for blockages and confirm that water movement has not fallen.
5. Observe every Cory after maintenance for normal swimming, breathing and feeding behaviour.

the recommendation is a 25% change at least once every week. More frequent action may be prompted by test results, but do not turn the weekly instruction into a larger routine change without using the measured aquarium condition to guide the decision.

Protect the filter bacteria during cleaning

If filter media needs cleaning, do not run it under the tap. Rinse it lightly in aquarium water removed during the partial water change. OATA gives this method because chlorine or chloramine can kill the beneficial bacterial population established in the media, while a light rinse in removed aquarium water reduces bacterial loss.

Increase the livestock population slowly. OATA explains that adding fish and increasing food creates a larger waste load, while the bacterial population needs time to grow. Adding too many fish too quickly can lead to new tank syndrome, with ammonia and nitrite rising because nitrifying bacteria cannot yet process the waste.

Use the test record to judge whether the routine is working. Stable zero readings for ammonia and nitrite, nitrate held within the stated limit and consistent fish behaviour indicate that maintenance is keeping pace. A change in those results is a reason to examine the aquarium promptly rather than waiting for the next scheduled task.

Follow the arrival and acclimatisation steps in order

Prepare the mature, heated and filtered aquarium before the parcel arrives. OATA advises checking that ammonia and nitrite are 0 mg/l before adding fish and increasing livestock numbers slowly so the biological filter can adjust to the extra waste and feeding.

Arrange for someone to be at the delivery address to receive the parcel. The Tropical Fish Co delivery and Live Arrival Guarantee policy explains the packing, receipt and claim requirements. Fish are hand-bagged in pure oxygen, placed in an insulated poly box and given a heat pack when the weather calls for it, then carried by a licensed live-animal courier.

On arrival

1. Start filming while the parcel is still sealed and the outer box is visible, before opening it or floating the bag.
2. Open the parcel in one continuous take and show the fish while it is still inside the sealed bag, before anything is disturbed.
3. Open and inspect the parcel on the same day it arrives.
4. Float the bag for 20–30 minutes before releasing the fish.
5. For a Live Arrival Guarantee claim, contact us the same day with the order number and continuous unboxing video showing the sealed parcel, opening and fish still in the bag.

Begin filming at the sealed parcel for every delivery so the full sequence is captured if a problem becomes apparent. Do not begin filming after the box has been opened or after the bag has started floating.

Use water and behaviour as the settling checks

After release, observe swimming, breathing, appearance and interest in food. OATA advises watching for changes from the animal's normal pattern and testing water promptly when a concern appears. Keep ammonia and nitrite at 0 mg/l and confirm that temperature remains within 22–27°C.

During the first week, make short daily observations and retain the normal weekly testing schedule. The useful questions are concrete: does every fish move normally, can every fish reach sinking food, are breathing and colour consistent, and do ammonia and nitrite remain at zero? These checks connect the arrival to the established care routine without introducing a separate temporary standard.

Respond to health changes with observation and water tests

Learn the group's usual swimming, resting, surface visits and feeding pattern so a change is easy to recognise. FishBase records air-taking as part of this species' biology, which means an individual trip to the surface has to be read in context. A change in frequency combined with altered breathing, posture or appetite deserves prompt attention.

Check the whole pattern

OATA recommends testing water quality when any of these changes appears. Check ammonia and nitrite against the 0 mg/l target, confirm the routine temperature and compare nitrate with the tap-water baseline. Also inspect the filter for blockages and review recent feeding, maintenance and livestock additions.

Record which fish is affected, what changed and the measured water results. That information distinguishes a group-wide environmental change from a problem first noticed in one animal and makes the next decision more precise.

Contact us for further guidance when a health concern continues after the immediate water and equipment checks. Give the observed signs and measured results rather than selecting a treatment from appearance alone. Keep routine care focused on prevention: established filtration, weekly testing, a 25% water change at least once a week, direct feeding and enough space for the complete group.

Build a social group of at least five

Keep at least five Albino Bronze Corys together. FishBase gives aquarium keeping in groups of five or more, while OATA says Corydoras are shoaling fish and warns that individuals kept singly or in groups that are too small often become stressed. Seriously Fish describes the species as peaceful and gregarious and recommends a group of at least four to six; five therefore meets the explicit FishBase and OATA floor.

The wild social observation is larger: FishBase records adults in schools of 20 to 30 individuals. Treat that as natural-history context, not as a requirement to place 20 fish in the recommended aquarium. Aquarium stocking must still account for the 80 × 30 cm base, filter capacity, feeding access and every other inhabitant.

Count the planned total

• No existing group: plan for at least five and prepare the aquarium and filter for the complete group.
• Three already present: the plan needs at least two more to reach five, but additions should still be paced according to filter maturity and water results.
• Five already present: the stated minimum is met; any further addition becomes a space, waste and feeding decision rather than a way to satisfy the minimum.
• A larger group: increase usable floor space and filtration capacity instead of holding the aquarium at the minimum planning dimensions.

Observe the group at feeding time. Social housing is not complete if some members consistently fail to reach food. Place sinking food where the whole group can forage and confirm that every fish participates within the few-minute feeding window.

Use behaviour as a continuing check rather than expecting a fixed display. FishBase describes the species as nocturnal and benthic, and aquarium individuals may alternate between foraging, resting under cover and travelling to the surface for air. The essential decision is to give them companions of their own kind, accessible floor space and a predictable feeding routine.

Screen every community plan before mixing fish

Consider peaceful community fish only after checking water, space, waste production and feeding. OATA describes Corydoras as excellent additions to community aquariums, while Seriously Fish describes this species as peaceful and gregarious. Those descriptions support a community role, but each proposed combination still has to pass the practical checks below.

A shared temperature figure is only one part of compatibility. Two fish may overlap in temperature while the aquarium lacks enough floor space, the biological filter cannot process the total waste, or food fails to reach the Cory group. Make the decision using all six checks rather than a single matching number.

No named companion is universal across every aquarium. Stocking density, aquarium dimensions, filter maturity and the needs of the proposed fish can change the result. If any pass condition fails, choose a different community plan or increase the aquarium's capacity before introducing more livestock.

Continue screening after introduction by observing feeding and behaviour and by testing ammonia and nitrite. OATA advises increasing numbers slowly because beneficial bacteria need to respond to the larger waste load. A peaceful community remains suitable only while water quality, space and food access continue to meet the requirements of every inhabitant.

Answer the key care questions before choosing

How big does the Albino Bronze Cory get?

It reaches 7.5 cm standard length, the maximum recorded by FishBase and the figure used for long-term space planning.

What size aquarium does this fish need?

Use a base of at least 80 × 30 cm. Seriously Fish equates that to about 72 litres, while OATA recommends at least 80 litres for a shoal of smaller catfish.

How many Albino Bronze Cory should I keep together?

Keep at least five together. FishBase gives aquarium keeping in groups of five or more, and OATA warns that Corydoras kept singly or in groups that are too small often become stressed.

Does it suit a beginner?

Use the care requirements as the test: prepare a mature filtered aquarium, maintain 22–27°C, keep ammonia and nitrite at 0 mg/l, provide at least five fish and complete the weekly maintenance.

What does the Albino Bronze Cory eat?

Feed quality sinking dried food as the staple, with small live or frozen foods such as bloodworm and Tubifex, plus freeze-dried bloodworm. Feed once daily, only what the group eats within a few minutes.

What temperature and pH does this fish need?

Keep it at 22–27°C, pH 6.0–8.0 and 4–15 dGH; these routine values are the overlap of Seriously Fish aquarium guidance and OATA’s freshwater-catfish group guidance.

Is the Albino Bronze Cory aggressive or likely to nip fins?

Seriously Fish describes it as peaceful and gregarious. Build a group of at least five, then observe every community member’s behaviour and feeding rather than relying on a temperament label alone.

What kinds of animals can it live with?

Consider peaceful community fish only after confirming the same temperature and water range, enough aquarium space, manageable waste production and reliable feeding access for the Cory group.

How does the Albino Bronze Cory arrive alive in the UK?

Start filming the still-sealed parcel before opening it or floating the bag. The delivery policy says fish are hand-bagged in pure oxygen, packed in an insulated poly box with a heat pack when weather calls for it, and carried by a licensed live-animal courier; float the bag for 20–30 minutes before release.

Check the scientific and care references

• FishBase: Osteogaster aenea — accepted identity, family, distribution, recorded adult length and wild biology.
• Seriously Fish: Corydoras aeneus — aquarium footprint, water, substrate, diet and social behaviour.
• OATA freshwater-catfish care sheet — UK group guidance on water quality, feeding, maintenance and introduction.
• RSPCA aquarium environment guidance — biological filtration and the aquarium nitrogen cycle.