Threestripe catfish (Corydoras trilineatus) — 3-4cm

Overview

The corydoras catfish for sale species Corydoras trilineatus, commonly known as the threestripe catfish, false julii cory, or three line catfish, is a hardy, peaceful bottom-dwelling catfish native to the central Amazon River basin across Brazil, Colombia, and the Peruvian Amazon, with reports also from coastal rivers in Suriname. With an adult size of just 3.5 cm, this charming species is one of the smaller Corydoras available and is perfect for community aquariums. Available from Tropical Fish Co, the trilineatus cory is prized for its attractive striped patterning, lively personality, and constant activity along the substrate. This freshwater tropical fish UK is ideal for buy cory catfish UK enthusiasts seeking a small, active, and easy-to-care-for south american catfish for aquarium setups.

Appearance

Corydoras trilineatus displays a compact, armored body with a pale cream to tan base color and three prominent horizontal dark stripes running along the flanks, giving the species its "threestripe" common name. The body is covered in overlapping bony plates (scutes) for protection. The head is small with a downward-pointing mouth equipped with short barbels for foraging. The fins are translucent with subtle spotting, and the tail is moderately forked. Healthy specimens show clear eyes, smooth skin, intact barbels, and a well-rounded belly. Juveniles and adults display similar coloration and patterning. This species is often confused with the true julii cory (Corydoras julii), hence the "false julii cory" common name, though the patterning differs slightly.

Natural Habitat

In the wild, Corydoras trilineatus inhabits slow-moving rivers, forest streams, floodplains, and shallow pools across the central Amazon River basin. The natural environment features warm, slightly acidic to neutral water with soft, sandy or muddy substrates and abundant leaf litter, submerged wood, and overhanging vegetation. These fish forage in groups along the substrate, sifting through sand and organic matter for small invertebrates and detritus. Natural conditions include subdued lighting, calm to moderate water flow, and plenty of cover. Replicating these conditions in captivity promotes natural behavior, reduces stress, and encourages the active, social behavior for which Corydoras are famous.

Aquarium Setup

A minimum 75-litre aquarium is suitable for a small group of Corydoras trilineatus (ideally 6+ individuals). Use a soft, fine sand substrate to protect their delicate barbels, as they constantly sift through the substrate while foraging. Provide plenty of hiding places using driftwood, smooth stones, caves, and dense plant cover such as Java fern, Amazon sword, and Cryptocoryne species. Floating plants help diffuse lighting and create shaded areas. Gentle to moderate filtration with minimal to moderate water flow is ideal, as these fish do not thrive in strong currents. A tightly fitted lid is recommended, though Corydoras are not strong jumpers. Subdued to moderate lighting is preferred, and the tank should have plenty of open substrate space for foraging.

Water Parameters

Three stripe corydoras thrive in water with a pH of 6.0-7.5 and temperatures between 22-28°C. Maintain excellent water quality with weekly partial water changes of 25-30%, keeping ammonia and nitrite at zero and nitrate below 20 ppm. Soft to moderately hard water is preferred, replicating natural Amazonian river conditions. Use a reliable heater and thermometer to maintain stable conditions. Ensure good oxygenation with gentle to moderate filtration, avoiding strong surface agitation. Stable, clean water conditions are critical for long-term health, preventing barbel damage, and avoiding common diseases such as ich and bacterial infections that can affect freshwater catfish UK species.

Feeding

Corydoras trilineatus is an omnivore that accepts a varied sinking diet. Offer quality corydoras pellets or wafers as a staple, supplemented with frozen or live foods such as bloodworms, daphnia, and brine shrimp, plus occasional vegetable matter and other meaty prepared foods. Feed once or twice daily, ensuring food reaches the substrate where these bottom feeders forage. Avoid overfeeding, which can degrade water quality. A varied, balanced diet supports healthy growth, vibrant coloration, robust immune function, and encourages natural foraging behavior. These active foragers also help keep the substrate clean by consuming leftover food and organic matter.

Behaviour

Corydoras trilineatus is a peaceful, highly social species that thrives in groups. They are active bottom-dwellers, constantly foraging along the substrate with their barbels, sifting through sand and organic matter in search of food. They are most active during the day and evening, unlike many catfish species. Their social nature means they often swim in coordinated groups, resting together in shaded areas and engaging in playful, synchronized movements. They are non-aggressive and pose no threat to other tank inhabitants. Their lively, endearing behavior and constant activity make them one of the most popular and rewarding bottom feeder fish UK species for community aquariums.

Tank Mates

Ideal tank mates for false julii cory include small peaceful community fish such as tetras, rasboras, livebearers, and small peaceful loaches. Avoid large aggressive cichlids, fin-nipping fish, large predatory fish, and very boisterous species that outcompete bottom feeders for food or stress them with excessive activity. Multiple Corydoras species can often be kept together in mixed groups. Shrimp and snails coexist well. Their peaceful, social nature and small size make them one of the best tropical catfish for sale UK options for peaceful, planted community fish for sale setups with similarly gentle tankmates.

Breeding

Corydoras trilineatus spawning is usually triggered by excellent water quality, a cooler water change (2-3°C drop), and a high-protein diet to condition breeding groups. They are egg scatterers, with females carrying eggs between their pelvic fins before depositing them on smooth surfaces such as aquarium glass, broad plant leaves, or décor. Adults may eat eggs, so remove eggs or breeding adults if you want to raise fry. Provide fine-leaved plants or spawning surfaces for egg deposition. Eggs hatch in 3-5 days, and fry require very fine foods such as infusoria or liquid fry food initially, progressing to newly hatched brine shrimp as they grow. Breeding Corydoras is a rewarding experience for aquarists of all levels.

Why Buy from Tropical Fish Co

Tropical Fish Co is your trusted source for healthy, captive-bred corydoras trilineatus for sale UK, including the popular false julii cory. Each fish is quarantined, health-checked, and carefully acclimatized before dispatch, ensuring you receive vibrant, disease-free specimens ready to thrive in your aquarium. Our expert team provides personalized care advice, aquarium setup guidance, and ongoing support to help you succeed with these delightful corydoras catfish for sale. With secure packaging, next-day delivery across the UK, and a commitment to sustainable aquarium practices, Tropical Fish Co is the best place to buy corydoras trilineatus online UK. Whether you're building a peaceful planted tank or seeking active, charming additions to your community setup, our threestripe catfish deliver both personality and function.