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Species

Browsing 948 species. Use the filters below to narrow down.

Manduba, Slopehead Catfish

Manduba, Slopehead Catfish

Fish

Ageneiosus inermis

A giant, predatory catfish with one of the most unusual reproductive strategies in freshwater.

Mantis Shrimp

Mantis Shrimp

Invert

Odontodactylus havanensis

A Brazilian Atlantic crustacean that brings serious predator energy to the right tank.

Many-spined Cowfish

Many-spined Cowfish

Fish

Lactoria diaphana

A boxy, horned oddity that roams reefs and mudflats across the entire Indo-Pacific.

Marbled Climbing Perch

Marbled Climbing Perch

Fish

Ctenopoma weeksii

A cryptic Congo predator that vanishes into leaf litter before your eyes.

Marbled Goby

Marbled Goby

Fish

Oxyeleotris marmorata

A motionless giant that eats anything fitting in its enormous mouth.

Marbled Goby

Marbled Goby

Fish

Pomatoschistus marmoratus

A cryptic little sand-dweller from Europe's coasts, full of quiet personality.

Marbled Hatchetfish

Marbled Hatchetfish

Fish

Carnegiella strigata

A deep-keeled surface dweller that brings life to the upper third of any tank.

Marbled Lungfish

Marbled Lungfish

Fish

Protopterus aethiopicus aethiopicus

An ancient African lungfish that breathes air and can outlast a drought.

Marbled Lyretail

Marbled Lyretail

Fish

Fundulopanchax marmoratus

A rare Cameroonian killifish with detailed marbled patterning and a preference for cool water.

Marine Betta

Marine Betta

Fish

Calloplesiops altivelis

A cave-dwelling mimic that fools predators by impersonating a moray eel.

Masked Puffer

Masked Puffer

Fish

Arothron diadematus

A bold Red Sea puffer with a dramatic masked face and serious bite.

Masken Apisto

Masken Apisto

Fish

Apistogramma paulmuelleri

A tiny Peruvian dwarf cichlid with outsized color and surprisingly bold personality.

Maulbrüter Apisto

Maulbrüter Apisto

Fish

Apistogramma barlowi

The only Apistogramma that mouthbroods. Or doesn't, depending on its mood.

Mbu Puffer

Mbu Puffer

Fish

Tetraodon mbu

A Congo giant that demands respect, space, and a very sturdy tank.

Mccosker's Flasher

Mccosker's Flasher

Fish

Paracheilinus mccoskeri

A tiny reef wrasse where the males put on a color show like no other.

Mcculloch's Anemonefish

Mcculloch's Anemonefish

Fish

Amphiprion mccullochi

A rare island endemic with a bold personality that punches well above its size.

Media Luna Pupfish

Media Luna Pupfish

Fish

Cualac tessellatus

A rare Mexican pupfish with a conservation story worth getting behind.

Mediterranean Fried Egg Jellyfish

Mediterranean Fried Egg Jellyfish

Invert

Cotylorhiza tuberculata

The Mediterranean jellyfish that looks exactly like a fried egg.

Mediterranean Killifish

Mediterranean Killifish

Fish

Aphanius fasciatus

A rare Mediterranean killifish that rewards dedicated keepers with fascinating, constant activity.

Meklong Spiny Eel

Meklong Spiny Eel

Fish

Macrognathus meklongensis

A secretive Thai spiny eel that comes out of hiding when hunger calls.

Mekong Croaking Gourami

Mekong Croaking Gourami

Fish

Trichopsis schalleri

The tiny gourami that actually produces sounds to resolve conflicts and court mates.

Mekong Freshwater Stingray

Mekong Freshwater Stingray

Fish

Dasyatis laosensis

A true river stingray from the Mekong, built for life on sandy bottoms.

Mekong Puffer

Mekong Puffer

Fish

Tetraodon suvattii

A bottom-hugging Mekong puffer that buries itself in river mud.

Mekong Ricefish

Mekong Ricefish

Fish

Oryzias mekongensis

A tiny Mekong native with vivid fin markings and surprisingly easy breeding habits.

Mekong Tiger Perch

Mekong Tiger Perch

Fish

Datnioides undecimradiatus

A boldly barred Mekong predator with a long memory and a short temper.

Mendezi Dwarf Cichlid

Mendezi Dwarf Cichlid

Fish

Apistogramma mendezi

A blackwater dwarf cichlid with a surprisingly gentle nature and fascinating cave-breeding habits.

Merry Widow

Merry Widow

Fish

Phallichthys amates

A low-key Central American livebearer that thrives where flashier fish struggle.

Meteor Basslet

Meteor Basslet

Fish

Liopropoma susumi

A secretive reef cave-dweller with bold pinstripes and peaceful manners.

Mexican Barnacle Blenny

Mexican Barnacle Blenny

Fish

Acanthemblemaria macrospilus

A pint-sized reef blenny that claims abandoned barnacle shells as its castle.

Milkspotted Puffer

Milkspotted Puffer

Fish

Chelonodon patoca

A schooling puffer from mangrove estuaries that gets surprisingly large.

Mini Chocolate Gourami

Mini Chocolate Gourami

Fish

Parasphaerichthys lineatus

A tiny Burmese labyrinth fish with some of the most unpredictable breeding behavior in the hobby.

Mini-piranha

Mini-piranha

Fish

Serrasalmus sanchezi

A misidentified mini-piranha relative with razor teeth and a fiery red throat.

Mirror Basslet

Mirror Basslet

Fish

Pseudanthias pleurotaenia

A rare, large anthias that demands respect, and space, in the reef tank.

Mokele-mbembe Bichir

Mokele-mbembe Bichir

Fish

Polypterus mokelembembe

An ancient, armored predator from the Congo's murky depths.

Monkey Bay Cichlid

Monkey Bay Cichlid

Fish

Alticorpus mentale

A deep-water Malawi cichlid from sandy depths rarely seen in the hobby.

Moon Jellyfish

Moon Jellyfish

Invert

Aurelia aurita

striking open-water drifter that needs its own specialized kreisel tank.