Julii Corydoras tank mates
A small spotted cory frequently mislabelled in shops. True julii and the similar trilineatus have slightly different spot patterns but identical care needs.
Common mistakeKeeping four julii cories in an empty 60L as cleanup crew is how keepers invent permanently shy bottom fish. A larger same-species group with calm midwater company gives them confidence to forage openly. Soft sand beats bare glass and sharp gravel.
Each name below opens a pair check with Julii Corydoras. That check is the decision, not the list itself.
Usually safer companions
Conservative shortlist from this profile. Open a pair page before you buy.
The Julii Corydoras profile lists Dwarf Gourami as both safe and a recommended pairing. Dwarf Gourami swims in the top zone while Julii Corydoras stays in the bottom, so the two will not crowd the same water column.
The Julii Corydoras profile lists Ember Tetra as both safe and a recommended pairing. Ember Tetra schools in groups of 8 or more, so plan room for the whole group rather than one fish. Ember Tetra swims in the middle zone while Julii Corydoras stays in the bottom, so the two will not crowd the same water column.
The Julii Corydoras profile lists Honey Gourami as both safe and a recommended pairing. Honey Gourami swims in the top zone while Julii Corydoras stays in the bottom, so the two will not crowd the same water column.
The Julii Corydoras profile lists Neon Tetra as both safe and a recommended pairing. Neon Tetra schools in groups of 6 or more, so plan room for the whole group rather than one fish. Neon Tetra swims in the middle zone while Julii Corydoras stays in the bottom, so the two will not crowd the same water column.
Risky or situational
May work with more water, a mature system, or a species-only setup. Read the pair page before you experiment.
Angelfish reaches 20cm and is flagged predatory or as likely to eat small fish. Adult-size Julii Corydoras at 5cm is inside that gape range. Angelfish is rated semi-aggressive, so expect chasing, fin damage, or display behaviour directed at Julii Corydoras. Run the pair checker before stocking.
Fish to avoid with Julii Corydoras
Predation, aggression, or space rules on this profile. Treat these as poor default mixes.
Jack Dempsey reaches 25cm and is flagged predatory. Julii Corydoras at 5cm is prey-sized for it. Jack Dempsey needs at least 200L, far above the 60L minimum for Julii Corydoras. The tank that houses one stresses the other. Jack Dempsey is rated aggressive and Julii Corydoras is rated peaceful. No community-style planning carries that gap.
Oscar reaches 35cm and is flagged predatory. Julii Corydoras at 5cm is prey-sized for it. Oscar needs at least 300L, far above the 60L minimum for Julii Corydoras. The tank that houses one stresses the other. Oscar is rated aggressive and Julii Corydoras is rated peaceful. No community-style planning carries that gap.
Tank size and groups
- Published minimum for Julii Corydoras: 60L. Group minimum 6 (schooling).
- Compatibility changes when the tank is too short for turning, too little for a real school, or too warm for one species and not the other. That is why pair checks include tank context, not only temperament.
- Nearest litre hub to this minimum: 60L hub.
Plan before you buy
Start a pair check with Julii Corydoras, or open a starter plan with the top safer companions in the builder.
Tank hubs: 60L
Related reading
Guides that list other fish with the same trait, so you can plan around the group rather than one row.
- Schooling & group fish →
Plan the group of 6+ before choosing tank mates.
- Beginner-friendly freshwater fish →
Julii Corydoras is on this list. Hardier options for a first stock.
- Peaceful community fish →
Other peaceful species to shortlist beside Julii Corydoras.
Filtration & heating
A 60L minimum tank for Julii Corydoras needs a filter rated for at least 240L/hr turnover and a heater maintaining 22–28°C.
Similar fish (same category)
- Corydoras Catfish · min 60L
- Panda Corydoras · min 60L
- Salt and pepper cory / dwarf cory · min 60L
- Adolfoi cory · min 80L
- Glass Catfish · min 80L
- Peppered Corydoras · min 80L
- Pygmy Corydoras · min 30L
- Bronze corydoras · min 100L
Related (care + temperament)
Julii Corydoras tank mates — quick answers
- What fish can live with Julii Corydoras?
- Usually safer companions on this hub include Dwarf Gourami, Ember Tetra, Honey Gourami, Neon Tetra. Open each pair check before you buy — the list is a shortlist, not a guarantee.
- What tank mates should you avoid with Julii Corydoras?
- Avoid Jack Dempsey, Oscar based on size, temperament, or predation risk on this profile.
- What size tank do Julii Corydoras need for a community?
- 60L is the planning floor for adult swimming space and bioload. A 73L+ tank is the more comfortable long-term footprint. Length and depth matter as much as raw litres for active or territorial fish.