Orange Venezuelan Corydoras (Corydoras venezuelanus)

Choose a peaceful, social catfish

The Orange Venezuelan Corydoras (Corydoras venezuelanus) is a peaceful, gregarious freshwater catfish in the armoured-catfish family Callichthyidae. It comes from a South American lineage distributed from Colombia and Trinidad to the La Plata River basin east of the Andes, and it reaches 7.5 cm standard length. This is a good choice for beginners and experienced keepers who can provide a mature filtered aquarium, a group of at least five and enough bottom area for natural foraging. Our easy care rating reflects those practical requirements rather than suggesting that water quality or social needs can be overlooked.

FishBase now lists it as Osteogaster aenea and records quiet, shallow waters with soft bottoms as its main habitat, although it also occurs in running water. It is benthic, meaning that its routine activity is centred on the bottom. The fish is also a facultative air-breather and may make trips to the surface as part of its normal biology.

Plan long-term accommodation around an 80 × 30 cm base or equivalent, with a volume of around 72 litres. Those dimensions come from the Seriously Fish guidance for long-term care. The base area matters because this catfish feeds and moves along the substrate; a tall aquarium with less bottom space is not an equivalent choice merely because it holds a similar number of litres.

Keep the aquarium at 25–27°C, pH 6.0–8.0 and 5–15 dGH. These working values are the overlap of FishBase’s recorded environment, the Seriously Fish species guidance and OATA’s freshwater-catfish group guidance; OATA’s range is not a species-specific optimum.

Select the dispatch size and group total

One purchase supplies one Orange Venezuelan Corydoras in the size chosen on the live selector. The labels are 2,5 cm, 2,5 - 3 cm, 3 - 3,5 cm and 3.5-4 cm. The size you select is the size supplied, not the adult size. Plan every choice around the same recorded adult length of 7.5 cm and the same long-term aquarium requirements.

Dispatch length is useful for deciding how the new fish compares with the present occupants, but it must not be used to infer sex, age or life stage. Select the required purchase quantity with the group total in mind: this species should live with at least four more of its own kind. If the aquarium already contains this species, count the complete group rather than judging the new fish in isolation.

Sex is guaranteed only when the selected option explicitly states male or female. This Orange Venezuelan Corydoras listing has no sex-guaranteed option.

The gallery images are representative of this type of animal rather than photographs of the exact animal supplied, so colours can look slightly different from the live animal.

Make the decision in the right order

1. Check the mature aquarium: confirm that its base is at least 80 × 30 cm or equivalent and that the filter is established.
2. Check the group: plan for at least five Orange Venezuelan Corydoras in total.
3. Check the water: use measured temperature, pH and hardness rather than estimates.
4. Choose the dispatch label: select a length that fits the planned introduction without treating it as the fish’s final size.
5. Choose the quantity: each purchase quantity represents one fish.

If you are comparing this fish with other corydoras rather than choosing companions for the same aquarium, browse the current corydoras collection. Each species still needs its own check for adult size, group requirements, water and footprint.

Hold water inside the shared range

Keep the temperature at 25–27°C, the pH at 6.0–8.0 and general hardness at 5–15 dGH. This range sits inside all three relevant sets of figures: FishBase records 25–28°C, pH 6.0–8.0 and 5–19 dH; Seriously Fish uses 21–27°C, pH 6.0–8.0 and 2–15 dGH; OATA uses 22–27°C, pH 6.0–8.0 and 4–18 dGH for freshwater catfish.

Use actual test results to make the decision. A temperature reading of 26°C is inside the working interval, while 24°C or 28°C is outside it. A pH of 7.2 and hardness of 10 dGH both fit; pH 8.2 or hardness of 3 dGH does not. The water matcher can compare measured aquarium values with the range, while our water chemistry guide explains what the individual tests measure.

Check the complete set

• Temperature: verify that the heater and thermometer hold 25–27°C through the normal daily cycle.
• pH: confirm a measured value between 6.0 and 8.0.
• General hardness: confirm 5–15 dGH rather than assuming that a suitable pH also means suitable hardness.
• Ammonia and nitrite: both should remain at zero mg per litre.
• Nitrate: OATA advises that it should not exceed 20 mg per litre above the normal tap-water level.

Compare every result with the working interval before adding the fish. One suitable reading cannot compensate for another that falls outside its range, and a heater setting is not a substitute for a thermometer reading. Record the results so that a later change can be recognised rather than relying on memory.

The goal is a stable set of suitable values in a mature aquarium. OATA notes that larger aquariums tend to provide greater environmental stability, which is another reason to treat the 80 × 30 cm base and approximately 72-litre volume as a long-term starting point rather than choosing the smallest convenient container.

Provide enough bottom space for the group

Use an aquarium with a base of 80 × 30 cm or equivalent and a volume of around 72 litres for long-term care. The footprint is the decisive measurement because Orange Venezuelan Corydoras are benthic foragers. An aquarium can hold many litres while still giving too little usable bottom area, so check both the dimensions and the stated volume.

An 80 × 30 cm base provides 2,400 cm² of bottom area. Use that figure only as a quick comparison aid: the alternative still needs a practical shape that lets the group move and forage along the substrate. A tall aquarium with a small base should not be treated as equivalent solely because its nominal volume is around 72 litres.

Plan the space for at least five fish at their 7.5 cm adult length. The dispatch labels describe smaller fish, but the aquarium should meet the long-term requirement from the start. Moving a growing group later is not a substitute for preparing suitable accommodation before it arrives.

Check the layout before choosing the fish

• Base: at least 80 × 30 cm or a genuinely equivalent footprint.
• Volume: around 72 litres as the reference volume attached to that footprint.
• Group: room for at least five Orange Venezuelan Corydoras.
• Substrate: an open, clean foraging area as well as cover.
• Equipment: enough space for filtration and heating without removing the group’s usable bottom area.

FishBase also records a 60 cm aquarium length for aquarium keeping, but the more complete long-term recommendation is the 80 × 30 cm base from Seriously Fish. Use the longer footprint when planning the permanent aquarium.

A larger suitable aquarium can offer more stable temperature and water quality and gives more flexibility when arranging open substrate and shelter. Extra litres do not remove the need to test water, maintain the filter or screen community occupants; they give those decisions a more stable foundation.

Use clean substrate and secure cover

Choose fine sand as the ideal substrate. Rounded gravel is an acceptable alternative when it is kept scrupulously clean. Seriously Fish gives both choices for this species, while FishBase records wild fish mainly in quiet, shallow water with soft bottoms and also in running water.

Leave a useful open area where the group can forage. Cover should also be present so the fish have somewhere secure to withdraw. Plants, suitable ornaments and other aquarium décor can provide that security, but the arrangement should not consume the entire bottom or trap uneaten food where it cannot be removed.

Balance foraging room with security

Inspect the bottom during weekly maintenance. Fine food and solid waste can settle in low-flow pockets, particularly around ornaments and plant bases. Use the recommended siphon during the water change rather than allowing those areas to become permanent waste traps.

Do not design the aquarium around the idea that corydoras will clean the substrate for you. They forage there, but they still require dedicated food and routine waste removal. A layout is successful when the fish can feed naturally, reach secure cover and remain visible enough for daily observation.

Plants are useful as cover, but they are not a replacement for the footprint. Start with the 80 × 30 cm base, reserve open bottom space for the group and then add cover around that plan. This order prevents decoration from turning an adequate aquarium into one with too little practical foraging room.

Mature the filter before stocking

Run a well-established and maintained biological filter before adding the fish. The RSPCA explains that fish release toxic ammonia, which filter bacteria convert first to nitrite and then to the safer nitrate. Ammonia and nitrite must both remain at zero mg per litre.

For an aquarium of around 72 litres, Seriously Fish recommends turnover of four to five times the aquarium volume each hour. That corresponds to a filter rating of roughly 290–360 litres per hour. Check the manufacturer’s stated flow and make sure the installed filter continues to operate without blockages.

Prepare and mature a new aquarium before livestock arrives. Our first tropical aquarium guide sets out the preparation sequence. OATA advises increasing the fish population slowly because the beneficial-bacteria population must grow as livestock and feeding increase. Adding too many fish too quickly can produce new tank syndrome, with unhealthy ammonia and nitrite levels.

Use three checks rather than one

1. Biological check: ammonia and nitrite test at zero mg per litre.
2. Mechanical check: water is circulating and the filter is not blocked.
3. Capacity check: the filter and aquarium can support the planned corydoras group as well as the existing community.

A stated flow rating cannot demonstrate biological maturity on its own. Equally, zero ammonia on one test does not remove the need for regular testing after the number of fish or the feeding level changes. Keep the filter running, observe the livestock and record at least weekly test results.

Plan the social group before increasing the total aquarium population. Orange Venezuelan Corydoras need at least five of their own kind, so the system should have sufficient capacity for that group rather than relying on prolonged solitary keeping while an unsuitable filter catches up.

Feed a varied sinking diet

Use a quality sinking dried food as the staple, supported by small live, frozen or freeze-dried foods such as bloodworm and Tubifex. Seriously Fish describes Corydoras as foraging omnivores that accept sinking dried foods and small live and frozen varieties. FishBase records wild adults eating worms, crustaceans, insects and plant matter, so variety fits the animal’s recorded feeding biology.

Feed once a day and offer only what the group can eat within a few minutes. This portion and frequency come from OATA’s freshwater-catfish guidance. If food remains after the feeding period, reduce the next portion and make sure settled material is removed during maintenance rather than adding more.

Build each feed around four decisions

• Placement: use food that sinks to the bottom where the corydoras forage.
• Staple: choose a quality dried product suitable for an omnivorous catfish.
• Variety: rotate suitable small live, frozen or freeze-dried foods instead of relying on one item.
• Portion: give only what is eaten within a few minutes, once daily.

Watch the complete group during feeding. The goal is for each fish to reach appropriate food, not merely for food to land somewhere on the substrate. Cover and décor should not create hidden pockets where meals accumulate unseen.

Never expect this catfish to survive on leftovers from other aquarium inhabitants or rely on it to clean the aquarium. Bottom-dwelling behaviour does not turn waste, debris or missed community food into a complete diet. Dedicated sinking food is a planned meal, while siphoning and filter maintenance remain the keeper’s job.

Adjust the quantity according to what the fish actually consume within the stated time. A group that clears its portion in a few minutes has met the feeding test for that meal; food remaining well beyond that period indicates that the portion was too large. This approach links feeding to observation and reduces uneaten food that would otherwise break down and add waste to the water.

Complete the weekly maintenance cycle

At least once every week, change 25% of the aquarium water. Use a siphon to remove solid waste from the substrate while taking out the old water. Treat replacement tap water with conditioner to remove harmful chlorine or chloramine before adding it to the aquarium.

Test the water at least once per week. Ammonia and nitrite should remain at zero mg per litre, while nitrate should not exceed 20 mg per litre above the normal tap-water level. Record the results alongside temperature, pH and general hardness so changes can be recognised early.

Check the filter for blockages during the same maintenance cycle. If it needs cleaning, do not run it under the tap. Rinse it lightly in aquarium water removed during the partial water change, which reduces the loss of the beneficial bacteria established in the filter media.

Use a repeatable weekly order

1. Observe the fish before disturbing the aquarium, noting feeding response, swimming, colour, breathing and body condition.
2. Measure temperature, pH, hardness, ammonia, nitrite and nitrate.
3. Siphon the substrate while removing 25% of the water.
4. Check the filter for blockages and rinse media lightly in removed aquarium water when cleaning is needed.
5. Condition the replacement tap water before it enters the aquarium.
6. Restore the aquarium and confirm that the filter and heater are operating.

This order connects observation with measured water quality. If behaviour or appearance changes, the test record helps show whether water conditions changed at the same time. It also prevents filter cleaning from becoming a separate tap-water task that harms the bacterial population.

Keep the substrate standard in mind during every water change. Rounded gravel is acceptable only when it remains scrupulously clean, and fine sand still needs accessible areas where settled waste can be siphoned. Regular maintenance supports both choices; the corydoras should never be expected to perform that work by scavenging.

Follow the arrival steps in order

Be present to receive the parcel because live fish cannot be left unattended. The fish is hand-bagged in pure oxygen and packed in an insulated box, with a heat pack when the weather calls for it. A licensed live-animal courier carries the parcel, and tracking details are sent by email.

Follow the current delivery and Live Arrival Guarantee policy in this order:

1. Start filming every delivery while the parcel is still sealed: keep the outer box visible before it is opened.
2. Open it in one continuous take: show the fish still inside the sealed bag so its condition is visible before anything is disturbed.
3. Open and inspect the parcel on the day it arrives: retain the continuous video with the order details.
4. Float the bag for 20–30 minutes: acclimatise slowly before releasing the fish.
5. Release the fish without pouring bag water into the aquarium.

Before arrival, apply OATA’s aquarium checks separately: make sure the aquarium is an appropriate size, confirm that ammonia and nitrite are zero mg per litre and verify that the filter is mature. Match the aquarium to 25–27°C, pH 6.0–8.0 and 5–15 dGH before the sealed bag is opened.

The video begins with the unopened parcel, not with the bag already floating. Keeping the sequence continuous records the sealed box, opening and fish in the sealed bag before acclimatisation begins. The bag then floats for the full 20–30-minute period before release.

Send the order number and continuous unboxing video on the same day if a Live Arrival Guarantee claim is needed. The fish must remain visible inside the sealed bag in the video before release.

Watch for changes in the fish

Learn the group’s normal pattern and respond to changes. FishBase describes this catfish as nocturnal and facultatively air-breathing. Trips to the surface can therefore form part of its normal biology, but a change in frequency should be considered alongside breathing, swimming, feeding and measured water quality.

OATA recommends watching swimming behaviour, colour, temperament, breathing, appearance, body condition and food intake. Warning changes include hanging at the surface, prolonged sitting, erratic swimming, becoming darker or paler than normal, increased hiding, altered aggression, faster or slower gill movement, white spots, fluffy growths, damaged fins or scales, body-condition changes and reduced interest in food.

Use observation to trigger a measured response

Test the water whenever a meaningful change appears, even if the regular weekly test is not yet due. Compare the result with zero ammonia, zero nitrite, nitrate no more than 20 mg per litre above tap-water levels and the working temperature, pH and hardness ranges.

Do not choose a treatment from appearance alone. Record what changed, when it began, which fish are affected and the current test results, then contact us for guidance. Clear observations and measurements are more useful than a general statement that the fish looks different.

Continue daily visual checks after the first week. Feeding time provides a practical opportunity to see whether every member of the group reaches food, maintains its condition and follows its usual behaviour.

Screen every community match

Treat the Orange Venezuelan Corydoras as a peaceful, gregarious community catfish. Seriously Fish describes its temperament as peaceful, while OATA identifies Corydoras as suitable additions to community aquariums. A community label is not a guarantee between every possible combination, so assess each proposed animal before it is added.

Apply the same five checks to every proposal

Reject the idea of universal tank mates. The decision depends on the exact animal, its adult needs and the aquarium already in use. An animal that matches temperature but requires different hardness has failed the water check; one that matches all water values but prevents food reaching the bottom has failed the feeding check.

Keep the corydoras group central to the assessment. Community stocking must leave enough bottom space for at least five fish, open access to their sinking diet and secure cover. The aquarium still needs an 80 × 30 cm base or equivalent even when the other occupants spend most of their time higher in the water.

Observe the completed community for changes in hiding, feeding, swimming, aggression, fin condition and body condition. If a new pattern appears after an addition, test the water and assess access to food and space rather than assuming peaceful species descriptions settle every individual interaction.

Build the group before expanding the community

Keep at least five Orange Venezuelan Corydoras together. FishBase recommends aquarium groups of five or more, and OATA says Corydoras should be kept in groups of at least five because individuals kept alone or in groups that are too small often become stressed. Seriously Fish also describes the fish as gregarious and recommends at least four to six.

Use five as the practical floor shared by the aquarium guidance. FishBase records wild adults in schools of 20–30, but that natural-history observation is not an instruction to place 20–30 fish in the reference aquarium. The aquarium decision remains at least five, with any larger group assessed against footprint, filtration and total stocking.

Work from the final group total

• If the aquarium has four of this species, one additional fish brings the group to the five-fish floor.
• If the aquarium has two, plan the remaining group requirement rather than treating two as a permanent pair.
• If the aquarium cannot support at least five at adult size, revise the aquarium plan before adding the species.
• If other community fish already occupy the aquarium, include them when assessing filter capacity and usable space.

Prepare the biological filter for the intended group and increase the overall aquarium population carefully. OATA warns that beneficial bacteria must increase as fish numbers and feeding increase. This means the group requirement and filter capacity should be planned together, not solved by keeping one corydoras alone in an immature system.

Do not infer sex from dispatch size. The selector controls the length supplied, while the social instruction applies to every listed size. Build the group around shared care needs and the 7.5 cm adult length.

Answer common keeper questions

How big does the Orange Venezuelan Corydoras get?

It reaches 7.5 cm standard length. Plan its permanent aquarium around that recorded adult size rather than the smaller dispatch length.

What size aquarium does Corydoras venezuelanus need?

Use an aquarium with an 80 × 30 cm base or equivalent and a volume of around 72 litres for long-term care. The bottom footprint is the decisive measurement.

How many Orange Venezuelan Corydoras should I keep together?

Keep at least five together. FishBase recommends aquarium groups of five or more, and OATA says Corydoras kept alone or in groups that are too small often become stressed.

Is Corydoras venezuelanus suitable for beginners?

Our store rates it easy, and it can suit a beginner who provides a mature filtered aquarium, keeps at least five and maintains the stated water range and weekly routine.

What does an Orange Venezuelan Corydoras eat?

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

What temperature and pH does this fish need?

Keep it at 25–27°C, pH 6.0–8.0 and 5–15 dGH. These values are the overlap of FishBase’s recorded environment, the Seriously Fish species guidance and OATA’s freshwater-catfish group guidance.

Is it aggressive or likely to nip fins?

Seriously Fish describes it as peaceful and gregarious. Treat it as a peaceful bottom-dwelling community fish, maintain its social group and investigate chasing or fin damage rather than assuming it is normal.

What kinds of animals can it live with?

OATA places Corydoras in community aquariums. Choose peaceful community fish whose adult size, temperature, pH, hardness, space and feeding needs fit, and assess every proposed combination individually.

How does it arrive alive in the UK?

Start filming the sealed parcel before opening it, keep one continuous take through opening and showing the fish inside the sealed bag, then float the bag for 20–30 minutes before releasing. The fish is packed with pure oxygen in an insulated box, with a heat pack when the weather calls for it, and carried by a licensed live-animal courier.

Consult the care references

• FishBase: scientific identity, family, distribution, recorded environment, adult length, wild habitat, diet, air-breathing and social biology.
• Seriously Fish: aquarium footprint, approximate volume, water conditions, filtration, substrate, diet, temperament and group guidance.
• OATA: freshwater-catfish group guidance for water quality, group care, feeding, maintenance, introduction and health observations.
• RSPCA: biological filtration and aquarium waste processing.
• Tropical Fish Co delivery and Live Arrival Guarantee policy: packing, receipt, unboxing video and acclimatisation procedure.