Emerald corydoras
Corydoras splendens
easy careOverview
The emerald corydoras (Corydoras splendens, long known as Brochis splendens) is a larger, deeper-bodied cousin of the familiar corys, shimmering metallic green over a robust body. It behaves just like a classic corydoras — peaceful, shoaling, endlessly foraging — but its greater bulk means it needs more space and oxygen than the little species. Hardy and long-lived, it makes a superb centrepiece bottom-dweller for a mid-sized community.
Tank & water
A group of six needs at least 90 litres (24 gallons) of floor space to suit its size. Hold 22–26 °C with a heater and a filter giving good surface movement on stable, well-cycled water.
- Smooth substrate: sand or rounded gravel protects their barbels — see best aquarium sand and gravel and the substrate hub.
- Well-oxygenated water: these chunky fish appreciate steady flow and surface agitation.
- Cover: driftwood and planting give security.
Feeding
As omnivores, emerald corys are enthusiastic bottom foragers with a hearty appetite. Feed sinking pellets, wafers and granules — a sinking food that reaches the substrate is essential — plus frozen bloodworm and daphnia. See our best fish food picks. Their size means they eat well, so give a generous evening ration aimed at the floor.
Tankmates
Peaceful and sociable, emerald corys suit community tanks with tetras, rasboras, rainbowfish, angelfish and cherry shrimp. They shoal best with their own kind but coexist with other corys such as the bronze or sterbai. Their size makes them robust enough for slightly livelier communities than the tiny corys.
Frequently asked questions
The emerald corydoras brings metallic-green good looks and real presence to the bottom of a mid-sized tank. Give it space, smooth sand and well-oxygenated water in a group of six and it will thrive for a decade or more.
Emerald corydoras — frequently asked questions
Is the emerald corydoras a true corydoras?
It is very closely related and cared for identically, though it was long placed in the genus Brochis (as Brochis splendens) and you'll still see that name. It is a deeper-bodied, larger fish than most corys, but the same peaceful shoaling catfish at heart.
How big does an emerald corydoras get?
Larger than most corys — around 7–9 cm and noticeably chunkier through the body. That extra size means a bigger tank and more floor space than the little corys like pandas or pygmies, so plan for 90 litres and up for a proper group.
Why does my emerald cory keep darting to the surface?
Corydoras gulp air from the surface using their gut as an accessory breathing organ, which is normal. But frequent, frantic dashes can signal poor water quality or low oxygen, so check your parameters and surface movement if it seems excessive.
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