Julii corydoras care
Corydoras trilineatus · Amazon basin, Peru
The cory sold as julii is usually Corydoras trilineatus: pale gray with a fine black maze pattern.
- Tank size
- 20 US gal or larger
- Temperature
- 72 to 79 °F (22 to 26 °C)
- Group size
- 6 or more
- Temperament
- Peaceful
- Adult size
- 2.5 in
- pH
- 6 to 8
- Hardness (GH)
- 2 to 15 dGH
- Lifespan
- 5 to 10 years
- Diet
- Omnivore
- Care level
- Easy
In a 20 gallon long
30¼ × 12½ × 12¾ in outsideHow to keep julii corydoras
The cory sold as julii is usually Corydoras trilineatus: pale gray with a fine black maze pattern. Six or more on sand in a 20 gallon or larger tank suits any peaceful community.
Diet: Omnivore: sinking pellets, frozen foods. Fish food types compared · how often to feed.
Where they swim: Bottom of the tank.
Julii corydoras tank mates
Share the temperature and water, and neither side eats, nips or bullies the other. Check the full group in the stocking checker.
Platy
2.5 in · 10+ gal · 70–80 °F
American flagfish
2.5 in · 20+ gal · 65–79 °F
Odessa barb
2.5 in · 29+ gal · 68–79 °F
DrawingGolden pencilfish
2.6 in · 15+ gal · 75–82 °F
Pearl danio
2.6 in · 20+ gal · 68–77 °F
Colombian tetra
2.6 in · 30+ gal · 75–79 °F
Gardneri killifish
2.6 in · 10+ gal · 72–79 °F
Diamond tetra
2.4 in · 20+ gal · 72–82 °F
Keep apart
Pea puffer: Pea puffers belong in a tank of their own.
Amazon puffer: Amazon puffers nip slow fish such as julii corydoras.
Convict cichlid: Convict cichlids are aggressive towards peaceful fish such as julii corydoras.
Jewel cichlid: Jewel cichlids are aggressive towards peaceful fish such as julii corydoras.
Saulosi cichlid: Saulosi cichlids belong with other Lake Malawi cichlids, not with julii corydoras.
Red-tail dwarf puffer: Red-tail dwarf puffers belong in a tank of their own.
What a julii corydoras tank needs
A tank of 20 US gallons or more (such as the 20 gallon long) with a cover, and the equipment below.
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Aqueon PRO QuietFlow Power Filter 10
Rated by the maker for up to 20 US gal, which covers a 20 gallon julii corydoras tank without being built for a far bigger one.
Aqueon QuietFlow Internal Power Filter 15–30 gal
Rated by the maker for 15–30 US gal, which covers a 20 gallon julii corydoras tank without being built for a far bigger one.
hygger Precise Aquarium Heater 100W
Julii corydoras need 72 to 79 °F; most homes run cooler, so a heater holds the temperature.
API Freshwater Master Test Kit
Tests ammonia, nitrite, nitrate and pH, the readings that matter most before and after adding julii corydoras.
Seachem Prime 100 mL
Removes chlorine and chloramine from tap water at every water change.
Fluval Edge Thermometer
Shows the water temperature at a glance, so you know it stays within 72 to 79 °F.
More choices, each with the reason it is in or out: Filters for a 20 gallon tank · Heaters for a 20 gallon tank. We don’t list fish food: any good brand of the foods under Diet will do. Plan the whole tank's equipment →
Common julii corydoras problems
- Rough gravel damages their barbels.
Test the water first whenever fish look unwell: see what your readings mean, then match the symptom. For disease, a vet who treats fish can diagnose it and advise treatment.
More to compare
Sources
Name, origin and adult size checked against Wikipedia: Corydoras trilineatus. Temperature, pH, hardness, group size, lifespan and minimum tank size are common hobby guidance, not figures from that article. Ranges are the range the species tolerates; aim for the middle. Minimum tank sizes are for an adult group. Drawings are our own; photo credits follow.
Photo credits
Real photographs from Wikimedia Commons, resized and cropped to fit; each is used under the license named.
- Julii corydoras Bob Jenkins, CC BY 2.0, via Wikimedia Commons
- Platy Monika Korzeniec, CC BY-SA 3.0, via Wikimedia Commons
- American flagfish nat_t (iNaturalist), CC0, via Wikimedia Commons
- Odessa barb Anandarajkumar, CC BY-SA 3.0, via Wikimedia Commons
- Pearl danio Павлик Лисицын, CC BY 4.0, via Wikimedia Commons
- Colombian tetra Marrabbio2, CC BY-SA 3.0, via Wikimedia Commons
- Gardneri killifish Tommy Kronkvist, CC BY-SA 4.0, via Wikimedia Commons
- Diamond tetra SOK, CC BY-SA 4.0, via Wikimedia Commons
- Pea puffer Beta Mahatvaraj, CC BY-SA 4.0, via Wikimedia Commons
- Amazon puffer O. Schneider, CC BY-SA 3.0, via Wikimedia Commons
- Convict cichlid S. Olkowicz, CC BY 2.5, via Wikimedia Commons
- Jewel cichlid NasserHalaweh, CC BY-SA 4.0, via Wikimedia Commons
- Saulosi cichlid Gerard Delany, CC BY-SA 2.5, via Wikimedia Commons
- Red-tail dwarf puffer Neale Monks (English Wikipedia), CC BY-SA 3.0, via Wikimedia Commons
- Pygmy corydoras Birger A, CC BY-SA 3.0, via Wikimedia Commons
- Salt-and-pepper corydoras D.W., CC0, via Wikimedia Commons
- Bronze corydoras Quatermass (English Wikipedia), Public domain, via Wikimedia Commons
- Panda corydoras Chronotopian, CC BY-SA 3.0, via Wikimedia Commons
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