Julii Corydoras
Corydoras julii
Animalia›Chordata›Actinopterygii›Callichthyidae
📍 South America
The julii corydoras is often confused with the false julii (C. trilineatus) which is more commonly sold. True julii have spots that do not connect into lines. Both are charming, peaceful schooling fish suited to planted community tanks with fine substrate.
Care Guide
Diet
Julii corydoras are omnivores that primarily feed on sinking foods, including quality sinking pellets, algae wafers, and occasional frozen foods like bloodworms and tubifex worms. Feed small amounts once daily, providing only what they can consume in 2-3 minutes. They will also scavenge uneaten food and detritus from the substrate, making them valuable cleanup crew members.
Behavior
These peaceful, social catfish are bottom-dwellers that spend most of their time foraging through the substrate with their barbels. They are schooling fish and become noticeably more active and confident when kept in groups of 6 or more. They are nocturnal to crepuscular, showing peak activity during dawn, dusk, and nighttime hours.
Breeding
Breeding julii corydoras in captivity is possible but challenging and rarely occurs in home aquariums. Successful breeding requires cooler water temperatures (around 20°C), excellent water quality, and a well-established tank with plenty of hiding spots. 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
Both are bottom-dwellers with compatible water needs; non-competitive
Peaceful mid-water dweller; prefers slightly warmer temps but overlap is acceptable
Compatible water parameters; corydoras may occasionally consume shrimplets
Peaceful schooling fish with matching water requirements and temperament
Both are bottom-dwellers; ensure adequate space and hiding spots for both
Common Diseases
Barbel Erosion
Shortened, frayed, or missing barbels; reduced foraging ability
Improve water quality (especially ammonia/nitrite levels), increase water changes, provide fine sand substrate, and ensure adequate nutrition with varied foods
Ich (Ichthyophthirius multifiliis)
White spots on body and fins, flashing against substrate, rapid breathing
Raise temperature gradually to 28-30°C, perform daily water changes, use ich medication as directed, and ensure good aeration
Fin Rot
Frayed or deteriorating fins, discoloration at fin edges
Perform frequent water changes, improve water quality, remove sharp decorations, and use antibacterial medication if severe
Dropsy
Bloated abdomen, scales standing on end, lethargy, loss of appetite
Isolate affected fish, perform water changes, feed high-quality foods sparingly, and use antibiotics if bacterial infection is suspected
Community Photos
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Tanks keeping this 🐟
Kept by 2 hobbyistsCommunity tanks featuring Julii Corydoras.
Quick Facts
- diet
- Omnivore – sinking wafers, pellets, bloodworms, tubifex
- lifespan
- 5–8 years
- max size
- 5 cm (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)