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Species

Browsing 643 species. Use the filters below to narrow down.

Mahecola Barb

Mahecola Barb

Fish

Puntius mahecola

A rarely traded Kerala barb best appreciated in a lively, same-species school.

Mailed Cory

Mailed Cory

Fish

Corydoras amandajanea

A rare armored catfish from the Negro River that occasionally breathes air

Malawi Squeaker

Malawi Squeaker

Fish

Synodontis njassae

Lake Malawi's only squeaker, built for cichlid tanks and rocky hideouts.

Malaya Shrimp

Malaya Shrimp

Invert

Caridina babaulti

A hardy, color-shifting dwarf shrimp that surprises you with every molt.

Mandarin Dragonet

Mandarin Dragonet

Fish

Synchiropus splendidus

One of the most vividly colored fish on the reef, and one of the trickiest to keep.

Many Barred Distichodus

Many Barred Distichodus

Fish

Distichodus fasciolatus

A boldly barred Congo giant that stays surprisingly peaceful for its size.

Marble Shrimp

Marble Shrimp

Invert

Saron marmoratus

A boldly patterned reef shrimp that hides by day and roams by night.

Mario's cory

Mario's cory

Fish

Corydoras pinheiroi

A rare Amazonian cory that can breathe air and live for decades.

Masked Angelfish

Masked Angelfish

Fish

Genicanthus personatus

A rare Hawaiian endemic that's one of the most coveted angels in the hobby.

Maxima Clam

Maxima Clam

Invert

Tridacna maxima

A living jewel for the reef tank, with a lifespan that can outlast your mortgage.

Maya Tetra

Maya Tetra

Fish

Hyphessobrycon compressus

The founding species of its entire genus, rarely seen in the hobby.

Medusa pleco

Medusa pleco

Fish

Ancistrus ranunculus

A flat-headed, rock-hugging pleco from Brazil's wild river rapids.

Melon Barb

Melon Barb

Fish

Haludaria fasciata

An underrated Indian barb that rewards you with vivid male rivalry displays.

Menezesi Cory

Menezesi Cory

Fish

Aspidoras menezesi

A tiny Brazilian catfish with a surprisingly long lifespan and a Corydoras personality.

Merah Dwarf Barb

Merah Dwarf Barb

Fish

Boraras merah

Thumbnail-sized Borneo native that rewards patience with vivid schooling displays.

Merten's Butterflyfish

Merten's Butterflyfish

Fish

Chaetodon mertensii

A reef-associated butterflyfish that pairs up and patrols the deeper reef edges.

Metallic Topminnow

Metallic Topminnow

Fish

Girardinus metallicus

A livebearer from Cuba with a glinting metallic sheen and real historical quirks.

Meta Tetra

Meta Tetra

Fish

Hyphessobrycon metae

A tricky-to-identify Orinoco tetra that rewards patient, well-planned community tanks.

Mexican Dwarf Crayfish

Mexican Dwarf Crayfish

Invert

Cambarellus patzcuarensis

Tiny, peaceful, and full of personality. The dwarf crayfish that plays well with others.

Mexican tetra

Mexican tetra

Fish

Astyanax mexicanus

The cave fish that lost its eyes and gained extraordinary senses.

Micro Cory

Micro Cory

Fish

Corydoras hastatus

Tiny armored catfish that defies its family by cruising the midwater column.

Midget Chromis

Midget Chromis

Fish

Chromis acares

A tiny schooling damsel that brings reef-like energy to modest-sized tanks.

Millennium Cory

Millennium Cory

Fish

Corydoras spectabilis

The 'millennium cory'. A peaceful schooler with spotted flair from Brazil's Guaporé basin.

Minor Tetra

Minor Tetra

Fish

Hyphessobrycon minor

A peaceful little tetra from Guyana that's seldom seen in the hobby.

Molly

Molly

Fish

Poecilia sphenops

A livebearer classic that can thrive from freshwater all the way to full marine conditions.

Montezuma Swordtail

Montezuma Swordtail

Fish

Xiphophorus montezumae

A wild swordtail with an absurdly long tail sword that rivals its own body length.

Moonlight Gourami

Moonlight Gourami

Fish

Trichogaster microlepis

A silver-scaled Southeast Asian gourami with a gentle nature and labyrinth breathing.

Moorish Idol

Moorish Idol

Fish

Zanclus canescens

Iconic reef wanderer with a dramatic look that rarely thrives in captivity.

Mosaic Corydoras

Mosaic Corydoras

Fish

Corydoras haraldschultzi

A long-lived armored catfish with detailed reticulated markings and a surprisingly social personality.

Moth Catfish

Moth Catfish

Fish

Hara jerdoni

A moth-like micro catfish from Indian hill streams, best kept in groups.

Mottled Loach

Mottled Loach

Fish

Acanthocobitis botia

A peaceful, quirky bottom-dweller with a false eye that fools predators.

Mountain Barbel

Mountain Barbel

Fish

Amphilius platychir

A sleek African stream catfish built for life in fast, rocky currents.

Multicolor Sea Star

Multicolor Sea Star

Invert

Linckia multifora

A reef sea star that comes in a kaleidoscope of mottled patterns, each one unique.

Naked Characin

Naked Characin

Fish

Gymnocharacinus bergi

A scaleless South American oddity from one of the world's most isolated streams.

Nassarius Snail

Nassarius Snail

Invert

Nassarius vibex

A tireless sand-sifting scavenger that keeps reef substrate clean and aerated.

necklace nassa

necklace nassa

Invert

Nassarius distortus

A tidy little scavenger from the Yaeyama Islands with a distinctively ornate shell.