Species Catalogue
1,580 species — care guides, community photos, water parameters, and tank-mate compatibility.
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All guides →Lyretail Swordtail
Xiphophorus hellerii
Macropterus Corydoras
Corydoras macropterus
Madagascar Rainbow
Bedotia geayi
Maiden's Hair
Chlorodesmis fastigiata
Vivid blue-green turf-like tufts of very fine filaments — a common sight on Indo-Pacific reefs. In captivity it can spread across rockwork quickly. Produces terpene compounds that deter most grazers. Interesting as a biotope element but can become a nuisance if left unchecked.
Maingano
Melanochromis cyaneorhabdos
Malabar Danio
Devario malabaricus
Malaya Shrimp
Caridina malayensis
Marble Betta
Betta splendens 'Marble'
Marble Molly
Poecilia sphenops
Marble Oscar
Astronotus ocellatus
Marble Queen Sword Mini
Echinodorus cordifolius 'Mini'
Marbled Hatchetfish
Carnegiella strigata
Marbled Headstander
Abramites hypselonotus
Marbled Sleeper Goby
Oxyeleotris marmorata
Margarita Snail
Margarites pupillus
Marigold Platy
Xiphophorus maculatus
Marlier's Julie
Julidochromis marlieri
Marmorkrebs Crayfish
Procambarus virginalis
Maroon Clownfish
Premnas biaculeatus
Marsilea Quadrifolia
Marsilea quadrifolia
Maze Brain Coral
Platygyra daedalea
Mbu Puffer
Tetraodon mbu
McCosker's Flasher Wrasse
Paracheilinus mccoskeri
Medaka
Oryzias latipes
Melanistius Corydoras
Corydoras melanistius
Melanurus Wrasse
Halichoeres melanurus
Melon Barb
Haludaria fasciata
Melon Sword
Echinodorus osiris
Mermaid's Fan
Udotea flabellum
Elegant fan-shaped calcified macroalgae on a slender white stalk. Grows in sandy areas near reefs and seagrass beds. A beautiful decorative species for low-flow areas of the display tank. Like Penicillus, it anchors in deep sand and has a natural lifespan of several months.
Mermaid's Wine Glass
Acetabularia acetabulum
One of the most extraordinary organisms in biology — a single giant cell shaped like a wine glass on a slender stalk. Each 'plant' is a single cell that can grow to 10 cm. Famous in cell biology research. In aquariums it anchors in sand and is a remarkable conversation piece. Prefers cooler, calcium-rich water.
Mexican Oak Leaf
Shinnersia rivularis
Micrantha Lily
Nymphaea micrantha
Micranthemum Umbrosum
Micranthemum umbrosum
Microsorum Pteropus Needle Leaf
Microsorum pteropus 'Needle Leaf'
Midas Blenny
Ecsenius midas
Midas Cichlid
Amphilophus citrinellus