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๐Ÿ Schooling fish

Species that need the company of their own kind to thrive. Kept in appropriate groups, schooling fish produce some of the most mesmerizing displays in the hobby.

797 species

Acre Corydoras

Acre Corydoras

Fish

Corydoras acrensis

A little-known armored catfish from Amazonia that breathes air when it needs to.

Adolfoi's Catfish

Adolfoi's Catfish

Fish

Brachyrhamdia rambarrani

A Corydoras mimic from blackwater Brazil, rarely seen but worth the search.

Adolf's Cory

Adolf's Cory

Fish

Corydoras adolfoi

A boldly patterned Rio Negro cory that thrives in lively groups.

African Glass Catfish
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African Glass Catfish

Fish

Pareutropius debauwi

A schooling African catfish with a see-through body and lively personality.

African Longstripe Barb

African Longstripe Barb

Fish

Barbus holotaenia

A lively schooling barb from Central Africa, rarely seen but worth the hunt.

African Moon Tetra
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African Moon Tetra

Fish

Bathyaethiops caudomaculatus

A peaceful Congo schooler wearing a glowing crescent on its tail.

African Moony

African Moony

Fish

Monodactylus sebae

A bold brackish schooler from West Africa that needs space and company to truly thrive.

African Red-eyed Tetra

African Red-eyed Tetra

Fish

Arnoldichthys spilopterus

A bold West African schooler with vivid red eyes and iridescent scales worth showing off.

African Striped Darter

African Striped Darter

Fish

Nannocharax fasciatus

A tiny West African characin that rewards patient keepers with fascinating bottom-dwelling behavior.

Agassiz's Corydoras

Agassiz's Corydoras

Fish

Corydoras agassizii

A peaceful armored catfish with a notoriously tricky identity and a 20-year lifespan.

Agile Chromis

Agile Chromis

Fish

Chromis agilis

A reef-native schooling fish that brings natural movement to larger coral displays.

Albater Cory

Albater Cory

Fish

Aspidoras albater

A tiny Brazilian catfish with a surprisingly long lifespan and an unusual breathing trick.

Ambiacus Cory

Ambiacus Cory

Fish

Corydoras ambiacus

A spotty little armored catfish that occasionally surfaces for a gulp of air.

Anchor Catfish
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Anchor Catfish

Fish

Erethistes jerdoni

A tiny, peaceful catfish that hides by day and explores by night.

Anduzei's Nannostomus

Anduzei's Nannostomus

Fish

Nannostomus anduzei

The tiniest pencilfish, rarely seen but worth hunting down.

Ansorge's Characin

Ansorge's Characin

Fish

Neolebias ansorgii

A tiny West African gem that rewards patient keepers with rich, unexpected color.

Apalachee Shiner

Apalachee Shiner

Fish

Pteronotropis grandipinnis

A dapper little North American native that rewards patient, attentive keepers.

Apollo Shark

Apollo Shark

Fish

Luciosoma spilopleura

A fast-moving schooling fish wrapped in taxonomic mystery.

Argentine Tetra
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Argentine Tetra

Fish

Hyphessobrycon auca

A little Argentine tetra with subtle details that reward a close look.

Armatus Cory

Armatus Cory

Fish

Corydoras armatus

A tiny armored catfish that breathes air and handles low-oxygen conditions with ease.

Arrow Loach

Arrow Loach

Fish

Nemacheilus masyai

A boldly patterned river loach that holds its own with attitude to spare.

Aruli Barb
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Aruli Barb

Fish

Dawkinsia arulius

A long-lived Indian barb that rewards keepers who give it room and company.

Arulius Barb

Arulius Barb

Fish

Puntius tambraparniei

A lively, schooling barb from South India that rewards you with constant activity.

Asian Needlefish

Asian Needlefish

Fish

Xenentodon cancila

A torpedo-shaped freshwater predator that will absolutely bite the hand that feeds it.

Asian Stream Catfish
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Asian Stream Catfish

Fish

Akysis portellus

A tiny venomous stream catfish from Myanmar that's easier to keep than it looks.

Asian Stream Catfish
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Asian Stream Catfish

Fish

Akysis pulvinatus

A pint-sized Thai hillstream catfish that hides among rocks and rarely reaches an inch.

Asian Stream Catfish
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Asian Stream Catfish

Fish

Akysis vespertinus

A tiny, venomous stream catfish from Myanmar, rarely seen outside specialist collections.

Assam Badis

Assam Badis

Fish

Badis assamensis

A secretive Indian cave-spawner with remarkable breeding color displays.

Atropersonatum Cory

Atropersonatum Cory

Fish

Corydoras atropersonatus

A long-lived little armored catfish that actually breathes air from the surface.

Australian Blue-eye

Australian Blue-eye

Fish

Pseudomugil signifer

Australia's tiny blue-eyed shoaler thrives where streams meet the sea.

Australian Rainbowfish

Australian Rainbowfish

Fish

Melanotaenia fluviatilis

Australia's most cold-tolerant rainbowfish, built for temperate rivers and cool winters.

Axelrod's Rainbowfish
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Axelrod's Rainbowfish

Fish

Chilatherina axelrodi

A rare Papua New Guinean gem found in just one stream on Earth.

Bala Shark

Bala Shark

Fish

Balantiocheilos melanopterus

A shoaling fish that outgrows most home aquariums faster than owners expect.

Balga

Balga

Fish

Lates calcarifer

A giant predator that outgrows almost every aquarium on earth.

Banded Archerfish

Banded Archerfish

Fish

Toxotes jaculatrix

The fish that hunts above water, shooting insects down with pinpoint accuracy.

Banded Pyrrhulina

Banded Pyrrhulina

Fish

Pyrrhulina vittata

A pocket-sized Amazonian predator with big personality and delicate looks.

Popular strains & varieties

Named color morphs and bred strains across schooling fish species.

Heckel Crossstrain of DiscusThe Heckel Cross is a first-generation hybrid between a pure Symphysodon discus and a domesticated Symphysodon aequifasciatus strain, most often a Turquoise or Blue Diamond. The result is a fish that retains the bold, dark 1st, 5th, and 9th bars characteristic of the Heckel while layering in iridescent blue or turquoise patterning across the body. The bars are typically softer than a pure Heckel but still clearly dominant. Coloration can vary widely depending on the domestic parent used. Hardier than pure Heckel and more forgiving of slightly harder water, these are often recommended as a gateway into the Heckel look without the strict soft-water demands.Red Heckelstrain of DiscusRed Heckels are wild-caught Symphysodon discus specimens โ€” primarily from the Rio Negro and its blackwater tributaries โ€” selected specifically for intense reddish-orange base coloration overlaid with the classic three dominant Heckel bars. The body background shifts toward warm amber-red tones rather than the more common brown or olive base, and the iridescent striping often carries a blue-green shimmer in good light. These fish are not a captive-bred strain in the traditional sense; they are a regional color form. Expect strict water requirements: very soft (< 50 ppm TDS), acidic (pH 4.5โ€“6.0), and warm (82โ€“86ยฐF). Acclimation is slow โ€” don't rush it.Heckel Wildstrain of DiscusThe classic wild-caught Symphysodon discus, collected from blackwater systems of the central Amazon basin โ€” most famously the Rio Negro around Barcelos. Instantly identified by the three dramatically thickened, jet-black bars (bars 1, 5, and 9) standing out against a brown to olive-grey body with finer blue or red wavy striping across the flanks. No two fish look identical, and locality variation is significant. These are demanding fish: they require near-distilled, warm, acidic blackwater conditions to thrive and are intolerant of the shortcuts that captive-bred discus forgive. Wild feeding can be challenging early on โ€” live or frozen foods are often necessary to get them eating reliably.
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