One of the smallest Corydoras species, the Pygmy Cory is a true nano fish. Unlike most of their bottom-dwelling cousins, Pygmy Corys are famous for hovering and schooling in the mid-water area. They are extremely peaceful but very shy, requiring a proper school to feel secure. A soft sand substrate is absolutely required to protect their delicate barbels.
Pygmy Corydoras At a Glance
Pygmy Corydoras Tank Requirements
Will Pygmy Corydoras fit in your tank?
Care guides tell you what Pygmy Corydoras needs, the next question is whether your tank can safely provide it. Test Pygmy Corydoras against your tank size, maintenance needs, and the fish you already keep before you buy.
Pygmy Corydoras Water Parameters
Pygmy Corydoras Temperament & Compatibility
Pygmy Corydoras Varieties
Each variety inherits the species defaults above. Only differences are highlighted.
Standard
The standard form found in the aquarium trade. Must be kept in a group of at least 6 (though 10+ is highly recommended) to exhibit their natural mid-water hovering behavior and avoid severe stress.
Differs in 1 trait from base species
Also known as: Wild Type
Pygmy Corydoras Care Guide Summary
The Pygmy Corydoras, scientifically known as Corydoras pygmaeus, belongs to the Catfish family group. Adults reach a maximum size of approximately 3 cm and have a fusiform body shape with a moderate growth rate. Classified as peaceful, this species primarily occupies the mid-level and bottom zones of the aquarium and produces a low level of biological waste.
To thrive, the Pygmy Corydoras requires a freshwater only aquarium with a minimum volume of 38 litres and a tank length of at least 45 cm. Water temperature should be maintained between 22°C and 26°C, with a pH range of 6–7.5 and a general hardness of 2–15 dGH. A moderate water flow is preferred.
The Pygmy Corydoras is a rewarding species to keep, provided its core environmental needs are met. The Pygmy Corydoras is typically available in one standard form.
Pygmy Corydoras Habitat Setup
When setting up an aquarium for the Pygmy Corydoras, a moderate water flow best suits their natural preferences. Because this species occupies the mid-level and bottom zones, the aquarium layout should prioritise open swimming space in the centre of the tank for free movement and sufficient floor space with hiding spots among rocks, wood, or dense planting. Useful additions include a sand substrate to accommodate their sifting behaviour and dense planting to provide cover, break sightlines, and reduce stress.
Pygmy Corydoras Compatibility Notes
Classified as peaceful, the Pygmy Corydoras is a schooling species that feels most secure in a sizeable group, where natural shoaling behaviour reduces stress and brings out their best colours. Selecting tankmates that favour different water layers from the mid-level and bottom zones can help reduce competition and territorial overlap.
Who Pygmy Corydoras Is Actually For
Pygmy Corydoras is best for a fishkeeper who wants a species that can settle into a calmer community setup and can provide a keeper who can commit to a proper group of at least 6. It makes the most sense for a hobbyist who will actually build around its needs, especially sand.
The most common mistake is treating Pygmy Corydoras like any other community fish and skipping the soft sand it needs to forage safely. Another frequent problem is underestimating its social needs. A token pair or trio often behaves very differently from a real group.
Pygmy Corydoras Recommended Tank Sizes
Standard aquarium sizes that meet the minimum volume and length requirements for Pygmy Corydoras.
10 Gallon Standard
15 Gallon Standard
20 Gallon High
20 Gallon Long
29 Gallon Standard
30 Gallon Breeder
Show 22 more tank sizes
Frequently Asked Questions About Pygmy Corydoras
How big does Pygmy Corydoras get?
Pygmy Corydoras (Corydoras pygmaeus) typically reaches a maximum adult size of approximately 3 cm. They have a fusiform body shape and a moderate growth rate.
What tank size does Pygmy Corydoras need?
A minimum aquarium volume of 38 litres and a tank length of at least 45 cm are recommended for Pygmy Corydoras. This ensures enough swimming space and helps maintain stable water conditions.
What water parameters does Pygmy Corydoras need?
Pygmy Corydoras thrives in freshwater only conditions with a temperature range of 22–26°C, a pH between 6 and 7.5, and a general hardness of 2–15 dGH. A moderate water flow is preferred.
Is Pygmy Corydoras peaceful or aggressive?
Pygmy Corydoras is classified as peaceful with an aggression score of 0 out of 10. They are generally well-suited to peaceful community tanks.
How many Pygmy Corydoras should be kept together?
Pygmy Corydoras is a schooling species and should be kept in groups of at least 6. Larger groups help distribute aggression and encourage natural schooling behaviour.
Does Pygmy Corydoras have any special tank requirements?
Yes. Pygmy Corydoras benefits from sand (sifters) and plants - densely covered in the aquarium. These features help replicate their natural habitat and promote overall health and well-being.
Useful setup supplies
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Guidarium Editorial Desk
Reviewed against Guidarium care, stocking, and compatibility standards. Read the editorial policy.
- Last reviewed
- April 28, 2026
- Last updated
- April 28, 2026
- Issues or corrections?
- Contact the editorial team
Top Tank Mates for Pygmy Corydoras
These fish are strong compatibility matches for Pygmy Corydoras based on water preferences, temperament, adult size, and tank behavior.
Spotted Hillstream Loach
Gastromyzon punctulatus
Ideal Tank MatesTrapdoor Snail
Cipangopaludina chinensis
Ideal Tank MatesGolden Bristlenose Pleco
Ancistrus sp. L144
Ideal Tank MatesAssassin Snail
Anentome helena
Ideal Tank MatesBristlenose Pleco
Ancistrus cf. cirrhosus
Ideal Tank MatesZebra Apple Snail
Asolene spixi
Ideal Tank MatesPlants That Suit Pygmy Corydoras
These plants pair well with Pygmy Corydoras based on shared water preferences, layout fit, and how likely they are to hold up in the same aquarium.
Afzel's Anubias
Anubias afzelii
Amazon Sword
Echinodorus amazonicus
Anacharis
Egeria densa
Anubias Barteri
Anubias barteri
Baby Tears
Lindernia rotundifolia
Balansae
Cryptocoryne crispatula
Fish Similar to Pygmy Corydoras
Dwarf Cory (Tailspot Cory)
Corydoras hastatus
One of the true dwarf Corydoras species. Unlike most of their bottom-dwelling cousins, the Tailspot Cory spends a significant amount of its time hovering in the mid-water column. They are incredibly peaceful, schooling nano fish that must be kept in groups. A fine sand substrate is highly recommended to protect their delicate sensory barbels when they do forage on the bottom.
Dainty Cory (Salt and Pepper Cory)
Corydoras habrosus
A true dwarf Corydoras species, the Dainty Cory (Corydoras habrosus) is a highly active, peaceful bottom dweller. Unlike the Pygmy Cory (C. pygmaeus) which frequently swims in the mid-water column, the Habrosus stays true to typical Corydoras behavior by constantly sifting the substrate. They must be kept on fine sand to protect their delicate barbels and require a school of at least 6 to feel secure.
Peppered Corydoras
Corydoras paleatus
One of the most popular and hardy Corydoras species. Notably, they prefer cooler water temperatures than most tropical fish. They are peaceful, bottom-dwelling schooling fish that use their sensitive barbels to sift through the substrate for food. They must be kept in groups to thrive.
Pygmy Rainbowfish
Melanotaenia pygmaea
The smallest member of the Melanotaenia genus, endemic to the Prince Regent River area in Western Australia. They are highly active, schooling fish known for their stunning iridescent blue and mauve coloration in males. Despite their small size, they require ample horizontal swimming space to accommodate their energetic nature.
Asher Cory
Corydoras tukano
A striking and relatively uncommon small Corydoras originating from the blackwater Rio Tiquié in the upper Rio Negro basin. Known for its prominent vertical black bands across a pale tan or golden body. Like all Corydoras, they are completely peaceful, highly social bottom dwellers that must be kept in groups. A fine sand substrate is absolutely critical to prevent damage to their delicate barbels as they constantly sift for food.
Bronze Corydoras
Corydoras aeneus
A highly popular, peaceful schooling catfish known for its armor-like scales (scutes) and active bottom-feeding behavior. They are essential clean-up crew members but require a dedicated sinking diet (not just leftovers). Sand substrate is strictly required to prevent erosion and infection of their sensitive barbels. They are 'gut breathers' and will occasionally dart to the surface to gulp atmospheric air.