What tank size does a Julii Cory need?

A Julii Cory needs an aquarium of at least 60 litres (15.9 US gallons) with a footprint at least 60 cm (23.6 in) long — for this species, swimming length matters as much as raw volume.

What water parameters does a Julii Cory need?

Julii Cory does best at 20–26 °C (68–78.8 °F), pH 5.5–7.5 and a general hardness of 2–12 °dGH.

What group size does a Julii Cory need?

Julii Cory is a social species — keep a group of at least 6 so natural behaviour emerges and stress stays low.

Is the Julii Cory suitable for beginners?

Yes — Julii Cory is one of the easier species to keep and forgives typical first-tank mistakes, as long as the aquarium is cycled and maintained.

Species library

Julii Cory

Corydoras julii

Callichthyidae

FishDifficulty: ●●○○○Data: well-established

📷 Merlin Senger · CC BY-SA 3.0 · resized · Wikimedia Commons

Julii Cory — Corydoras julii — 📷 Merlin Senger · CC BY-SA 3.0 · resized · Wikimedia Commons

About

The julii cory is a small, finely spotted armored catfish from coastal river systems of northeastern Brazil, prized for the crisp black speckling and reticulated head pattern that give it the nickname leopard cory. The true species is rarely traded and is very commonly confused with the near-identical three-line cory (Corydoras trilineatus). Peaceful and gregarious, it patrols the bottom in busy shoals, sifting soft sand on sensitive barbels and thriving in a calm, well-planted community.

Care

Keep a shoal of 6 or more over soft, clean sand with gentle flow in soft to neutral water. Pair only with peaceful tankmates and feed sinking foods directly to the bottom.

Diet

Omnivorous scavenger that forages the substrate; offer sinking wafers and micro-pellets plus frozen or live bloodworm, daphnia and brine shrimp, ensuring food reaches the bottom.

Tankmate compatibility

Computed by the AquaSage engine for a spacious reference tank — always check the full verdict for your exact setup in the calculator.

Telling males from females

What works for this species, most reliable first.

Width from aboveStrong · from about 8 months, once they are adult-sized
Corydoras are sexed from directly above, never from the side. Look down at the group while they rest on the sand.
Bristles and cheek spinesA hint only · from about a year
Male plecos grow odontodes — spiny growths on the cheeks and along the leading pectoral rays. Bristlenose males additionally grow branching tentacles across the snout and over the top of the head.

All the methods, with diagrams

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Frequently asked questions

What tank size does a Julii Cory need?: A Julii Cory needs an aquarium of at least 60 litres (15.9 US gallons) with a footprint at least 60 cm (23.6 in) long — for this species, swimming length matters as much as raw volume.
What water parameters does a Julii Cory need?: Julii Cory does best at 20–26 °C (68–78.8 °F), pH 5.5–7.5 and a general hardness of 2–12 °dGH.
What group size does a Julii Cory need?: Julii Cory is a social species — keep a group of at least 6 so natural behaviour emerges and stress stays low.
Is the Julii Cory suitable for beginners?: Yes — Julii Cory is one of the easier species to keep and forgives typical first-tank mistakes, as long as the aquarium is cycled and maintained.

Sources

Water & tank

Temperature20–26°C

Optimal temp.22–25°C

pH5.5–7.5

Hardness (GH)2–12°d

Carbonate (KH)0–8°d

Adult size5.5 cm

Min. volume≥ 60 L

Min. tank length≥ 60 cm

Group size≥ 6

Swimming zoneBottom

TemperamentPeaceful

Water typeFreshwater

FlowModerate

Lifespan~5 yrs

Try in the calculator