What size tank do Julii corydoras need?
At least 20 gallons (76 liters) for a group of 6. The smallest standard tank that works is the 20 gallon high. A bigger tank is always easier to keep stable. We give the size for an adult fish in a proper group, because the small fish in the shop will grow. Scientific name: Corydoras trilineatus.
How many Julii corydoras in each tank size?
This is how many each standard tank carries comfortably if Julii corydoras are the only fish in it. Share the tank with other species and the number goes down.
| Tank | How many Julii corydoras |
|---|---|
| 5 gallon | Too small |
| 10 gallon | Too small |
| 20 gallon long | up to 8 |
| 29 gallon | up to 12 |
| 40 gallon breeder | up to 16 |
| 55 gallon | up to 22 |
| 75 gallon | up to 31 |
| 125 gallon | up to 52 |
Check Julii corydoras against your own tank and other fish
Good to know
- Keep at least 6. Alone or in twos and threes, Julii corydoras hide, stop eating well, or pick on each other.
Tank mates for Julii corydoras
These animals like the same water, are a safe size, and have a temper that fits. It is a match on paper: always watch new tankmates for the first week.
Poor matches
- Fancy goldfish: Goldfish do best with other fancy goldfish.
- Oscar: Oscar is aggressive and will bully or kill peaceful fish such as Julii corydoras.
- Molly: They need different water: Julii corydoras likes a pH of 6–7.8, molly likes 7.5–8.5.
Questions and answers
What size tank do Julii corydoras need?
At least 20 gallons (76 liters) for a group of 6. The smallest standard tank that works is the 20 gallon high. A bigger tank is always easier to keep stable.
How many Julii corydoras should be kept together?
At least 6. Julii corydoras are social animals and only behave naturally in a group. More is better if the tank has room.
Can Julii corydoras live in a 10 gallon tank?
No. Julii corydoras needs at least 20 gallons (76 liters).
What temperature do Julii corydoras need?
72–79 °F (22–26 °C), with a pH of 6–7.8. In most homes that means a heater.
Can Julii corydoras live with a betta?
Usually, yes, in a tank of 20 gallons (76 liters) or more. They like the same water: 75–79 °F (24–26 °C). Every betta has its own temper, so watch closely for the first week and have a spare tank ready.
More fish
Adult size, tank size and water ranges follow the mainstream care consensus (Seriously Fish species profiles and FishBase maximum lengths). Where sources differ we use the more cautious figure. Stocking numbers come from our stocking calculator.