What fish can live with Julii Corydoras?

Use the "Often compatible" lists as a shortlist, not a stocking plan. Always run the pair tool and check the footprint of your actual tank first. Verify behaviour for Julii Corydoras against your own reading before you buy.

What tank mates should you avoid with Julii Corydoras?

Avoid Oscar, Jack Dempsey, Angelfish based on size, temperament, or predation risk on file.

What size tank do Julii Corydoras need for a community?

60L is the planning floor for adult swimming space and bioload headroom. Long-term, a 73L+ tank lets adults use the full footprint without crowding the next species. Footprint, meaning length and front-to-back depth, matters as much as raw volume for active or territorial species.

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.

Evidence: partially verified

Confidence: high

Lists below are built from this species record (safest, best with, risky, unsafe) — each link opens a pair-level check, not a guarantee.

← Full Julii Corydoras profile·Compatibility checker·Tank builder·More catfish

Best tank mates (on file)

Merged from conservative safest and best with fields — de-duplicated by species.

Dwarf Gourami Pair check
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.
Ember Tetra Pair check
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.
Honey Gourami Pair check
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.
Neon Tetra Pair check
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

From risky tank mates and broad avoid with (excluding “unsafe” below). May work with species-only setups, more water, or mature systems — read the pair page.

None on file beyond the safe list.

Fish to avoid with Julii Corydoras

From the unsafe list — predation, aggression, or space rules on this profile.

Oscar See why (pair)
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.
Jack Dempsey See why (pair)
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.
Angelfish See why (pair)
Angelfish reaches 20cm and is flagged predatory. Julii Corydoras at 5cm is prey-sized for it. Angelfish needs at least 150L, far above the 60L minimum for Julii Corydoras. The tank that houses one stresses the other.

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

Pair checks for every mix, then multi-species stocking in the builder.

Open compatibility checker Tank builder

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.

Filter buying guide →Heater buying guide →Beginner plants guide →