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False Julii Corydoras
Corydoras trilineatus
Animalia›Chordata›Actinopterygii›Callichthyidae
📍 South America
Commonly sold as julii corydoras, C. trilineatus has spots that merge into broken lines along the body. It is extremely popular in the hobby due to its attractive pattern and ease of care. Active during the day and peaceful with all tankmates.
Care Guide
Diet
False Julii Corydoras are omnivores that thrive on a varied diet of sinking pellets, frozen foods (bloodworms, brine shrimp, daphnia), and algae wafers. Feed small amounts once daily, ensuring food reaches the bottom where they forage. They will also consume leftover food and algae, making them excellent cleanup crew members.
Behavior
These catfish are active bottom-dwellers that spend most of their time foraging through substrate with their barbels, searching for food particles and detritus. They are peaceful, schooling fish that exhibit reduced stress and more natural behavior when kept in groups of 6 or more. They are primarily nocturnal but often active during daylight hours, especially at feeding time.
Breeding
Breeding False Julii Corydoras in captivity is possible but challenging and rarely achieved by hobbyists. They require cooler water temperatures (around 20°C), frequent water changes, and specific conditioning with high-quality foods to trigger spawning. Eggs are typically laid on plants or tank glass, and fry are difficult to raise due to their small size and specific food requirements.
Tank Mates
Similar water parameters and peaceful temperament; occupy different water zones
Compatible bottom-dweller with identical water requirements and peaceful behavior
Peaceful schooling fish with overlapping temperature and pH preferences
Peaceful mid-water dweller; ensure adequate space and hiding spots
Compatible invertebrate; corydoras generally ignore shrimp but monitor for predation
Both are bottom-dwellers; ensure sufficient territory and hiding spaces to prevent conflict
Common Diseases
Barbel Erosion
Shortened or missing barbels, difficulty foraging, lethargy
Improve water quality, increase water change frequency, provide soft substrate (sand preferred over gravel), ensure adequate nutrition with quality foods
Ich (White Spot Disease)
White spots on body and fins, flashing against objects, rapid breathing
Gradually raise temperature to 28-30°C, perform daily water changes, use ich medication as directed; corydoras are sensitive to salt so avoid salt treatment
Fin Rot
Frayed or deteriorating fins, discoloration at fin edges
Perform frequent water changes, improve water quality, remove sharp decorations, use antibacterial medication if severe
Dropsy
Bloated appearance, pinecone-like scales, lethargy, loss of appetite
Isolate affected fish, perform water changes, feed quality foods, use antibacterial treatment; prognosis is often poor
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Quick Facts
- diet
- Omnivore – sinking pellets, frozen foods, algae wafers
- lifespan
- 5–8 years
- max size
- 5.5 cm (2.2 in)
- tank size
- 15 gallons minimum
- school size
- 6+
- temperament
- Peaceful, schooling
Water it likes
- ph
- 6.0–7.5
- ammonia
- 0 ppm
- nitrate
- <20 ppm
- hardness
- 2–12 dGH
- temperature
- 72–79°F (22–26°C)