A highly sought-after and relatively rare Corydoras species native to the upper Rio Negro basin. They are instantly recognizable by the striking black and white parallel stripes running along their flanks. Like all Corydoras, they are peaceful, strictly bottom-dwelling shoaling fish that must be kept in groups. They require a soft sand substrate to protect their delicate barbels as they forage for food.
Parallel Cory At a Glance
Parallel Cory Tank Requirements
Will Parallel Cory fit in your tank?
Care guides tell you what Parallel Cory needs, the next question is whether your tank can safely provide it. Test Parallel Cory against your tank size, maintenance needs, and the fish you already keep before you buy.
Parallel Cory Water Parameters
Parallel Cory Temperament & Compatibility
Parallel Cory Varieties
Each variety inherits the species defaults above. Only differences are highlighted.
Standard
The standard form found in the aquarium trade. Females may grow slightly larger and rounder than males, but husbandry needs are identical. Must be kept in a group of at least 6 to feel secure and display natural shoaling behaviors.
Same care requirements as the base species
Also known as: Unsexed, Wild Type
Parallel Cory Care Guide Summary
The Parallel Cory, scientifically known as Corydoras parallelus, belongs to the Catfish family group. Adults reach a maximum size of approximately 5.5 cm and have a depressed body shape with a moderate growth rate. Classified as peaceful, this species primarily occupies the bottom zone of the aquarium and produces a low level of biological waste.
To thrive, the Parallel Cory requires a freshwater only aquarium with a minimum volume of 60 litres and a tank length of at least 60 cm. Water temperature should be maintained between 24°C and 28°C, with a pH range of 5.5–7 and a general hardness of 1–10 dGH. A moderate water flow is preferred.
The Parallel Cory is a rewarding species to keep, provided its core environmental needs are met. The Parallel Cory is typically available in one standard form.
Parallel Cory Habitat Setup
When setting up an aquarium for the Parallel Cory, a moderate water flow best suits their natural preferences. Because this species occupies the bottom zone, the aquarium layout should prioritise sufficient floor space with hiding spots among rocks, wood, or dense planting. Useful additions include a sand substrate to accommodate their sifting behaviour.
Parallel Cory Compatibility Notes
Classified as peaceful, the Parallel Cory is a schooling species that feels most secure in a sizeable group, where natural shoaling behaviour reduces stress and brings out their best colours. When choosing tankmates, boisterous or fast-moving tankmates may cause this species undue stress. Selecting tankmates that favour different water layers from the bottom zone can help reduce competition and territorial overlap.
Who Parallel Cory Is Actually For
Parallel Cory 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 Parallel Cory 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.
Parallel Cory Recommended Tank Sizes
Standard aquarium sizes that meet the minimum volume and length requirements for Parallel Cory.
20 Gallon High
20 Gallon Long
29 Gallon Standard
30 Gallon Breeder
36 Gallon Bowfront
40 Gallon Breeder
Show 19 more tank sizes
Frequently Asked Questions About Parallel Cory
How big does Parallel Cory get?
Parallel Cory (Corydoras parallelus) typically reaches a maximum adult size of approximately 5.5 cm. They have a depressed body shape and a moderate growth rate.
What tank size does Parallel Cory need?
A minimum aquarium volume of 60 litres and a tank length of at least 60 cm are recommended for Parallel Cory. This ensures enough swimming space and helps maintain stable water conditions.
What water parameters does Parallel Cory need?
Parallel Cory thrives in freshwater only conditions with a temperature range of 24–28°C, a pH between 5.5 and 7, and a general hardness of 1–10 dGH. A moderate water flow is preferred.
Is Parallel Cory peaceful or aggressive?
Parallel Cory is classified as peaceful with an aggression score of 1 out of 10. They are generally well-suited to peaceful community tanks.
How many Parallel Cory should be kept together?
Parallel Cory 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 Parallel Cory have any special tank requirements?
Yes. Parallel Cory benefits from sand (sifters) in the aquarium. These features help replicate their natural habitat and promote overall health and well-being.
Useful setup supplies
We may earn from qualifying purchases
Guidarium Editorial Desk
Reviewed against Guidarium care, stocking, and compatibility standards. Read the editorial policy.
- Last reviewed
- May 11, 2026
- Last updated
- May 11, 2026
- Issues or corrections?
- Contact the editorial team
Top Tank Mates for Parallel Cory
These fish are strong compatibility matches for Parallel Cory based on water preferences, temperament, adult size, and tank behavior.
Lyretail Killifish
Aphyosemion australe
Ideal Tank MatesGreen Neon Tetra
Paracheirodon simulans
Ideal Tank MatesGarnet Tetra
Hemigrammus pulcher
Ideal Tank MatesMoonlight Gourami
Trichogaster microlepis
Ideal Tank MatesDwarf Rasbora
Boraras maculatus
Ideal Tank MatesDwarf Pencilfish
Nannostomus marginatus
Ideal Tank MatesPlants That Suit Parallel Cory
These plants pair well with Parallel Cory based on shared water preferences, layout fit, and how likely they are to hold up in the same aquarium.
African Onion Plant
Crinum calamistratum
Afzel's Anubias
Anubias afzelii
Amazon Sword
Echinodorus amazonicus
Anacharis
Egeria densa
Anubias Barteri
Anubias barteri
Ashy Pipewort
Eriocaulon cinereum
Fish Similar to Parallel Cory
Flagtail Cory (Mrs Schwartz's Cory)
Corydoras robineae
The Flagtail Corydoras is a striking and highly sought-after bottom dweller native to the Rio Negro basin. Characterized by the distinct black and white horizontal stripes on its caudal fin, it requires a soft sand substrate to protect its delicate barbels while foraging. Like all Corydoras, it is a highly social schooling fish and must be kept in groups to feel secure and display natural behaviors.
Loxozonus Corydoras (C079/C082)
Corydoras loxozonus
A peaceful, bottom-dwelling catfish native to the Rio Meta basin in Colombia. Known for the distinctive diagonal black stripe across its back and a mask over its eyes. Like all Corydoras, they are highly social and must be kept in groups. A soft, sandy substrate is strictly required to prevent damage to their delicate barbels as they sift for food.
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.
Black Fin Cory
Corydoras leucomelas
A peaceful schooling catfish native to the Amazon basin, easily identified by its black dorsal fin and a dark mask-like band across its eyes. Like all Corydoras, they are bottom-dwellers that use sensitive barbels to forage. They possess a modified intestine allowing them to gulp atmospheric air, so occasional darts to the surface are normal. They are highly social and require a soft sandy substrate to prevent barbel erosion.
Bandit Cory
Corydoras metae
A highly social, peaceful bottom-dwelling catfish endemic to the Rio Meta basin in Colombia. Instantly recognizable by the black 'bandit' mask over its eyes and the dark ridge stripe along its back. Like all Corydoras, they must be kept on a soft sand substrate to prevent severe damage and infection to their sensitive foraging barbels. They are schooling fish that require groups of at least 6 to thrive and display natural behavior.
Agassiz Cory
Corydoras agassizii
A peaceful, bottom-dwelling armored catfish native to the Amazon River basin. They are easily identified by their silvery body with dark spots and a distinct black mask over their eyes. Like all Corydoras, they are highly social and must be kept in groups. A soft sand substrate is absolutely essential to protect their delicate sensory barbels as they forage.