Species
Browsing 3,374 species. Use the filters below to narrow down.
Ocellated Snakehead
FishChanna pleurophthalma
Bold ocellus markings and predatory charisma from the peat swamps of Borneo.
Ocellated Wrasse
FishHalichoeres melasmapomus
A bold cheek-spotted wrasse with a wide Pacific range and big personality.
Ocellate Freshwater Stingray
FishPotamotrygon motoro
A disc-shaped apex predator that can learn to recognize its keeper.
Ocellifer Catfish
FishSynodontis ocellifer
A hardy West African catfish with bold spots and a long, distinctive adipose fin.
Octopus Coral
CoralGalaxea alta
A bold, spreading coral with dramatic polyp extension that commands attention.
Octopus Coral
CoralGalaxea astreata
A sprawling, tentacled coral with surprisingly sharp defensive reach.
Octopus Coral
CoralGalaxea cryptoramosa
A branching Galaxea with detailed fused corallites and a quietly distinctive look.
Octopus Coral
CoralGalaxea longisepta
A small encrusting coral with unusually long, irregular septa and bold white rims.
Octopus Coral
CoralGalaxea paucisepta
A small, textured reef coral with a knobby skeleton and calm disposition.
Ocular Coral
CoralMadrepora oculata
A deep-sea reef builder that occasionally ventures into aquarium-friendly depths.
Odessa Barb
FishPethia padamya
A barb with a mysterious past and males that blaze red when rivals are near.
Ogre Catfish
FishAsterophysus batrachus
A gulper catfish that can swallow prey nearly twice its own size.
Okavango Tilapia
FishTilapia ruweti
A compact African cichlid with big personality from wild swamp habitats.
Okinawa Goby
FishGobiodon okinawae
Tiny, vivid, and inseparable from its Acropora home.
Olga
FishCorydoras simulatus
A rarely documented Colombian cory with a color pattern that keeps even experts guessing.
Olive danio
FishDanio dangila
A large, active danio with impressively long barbels and a rarely seen wild side.
Olive Nerite Snail
InvertNeritina reclivata
A tough little algae grazer that thrives where fresh and salt water meet.
One-lined Pencilfish
FishNannostomus unifasciatus
A tiny pencilfish that swims at a permanent angle, day and night.
Oneline Tetra
FishNannaethiops unitaeniatus
A peaceful little African schooler that deserves far more attention than it gets.
One-spot Eartheater
FishSatanoperca lilith
A rarely traded eartheater with a single bold flank spot and surprising social depth.
One Spot Mouthbrooder
FishBetta unimaculata
A mouthbrooding Betta from Borneo that bucks the aggressive stereotype entirely.
Onespot Squeaker
FishSynodontis notata
A daytime-active catfish with a bold personality to match its bold spot.
One-stripe Anthias
FishPseudanthias fasciatus
A deep-reef anthias famous for swimming upside-down along cave ceilings.
One-stripe Spiny Eel
FishMacrognathus aculeatus
A serpentine burrower with a single bold stripe and a secretive personality.
Opae Ula
InvertHalocaridina rubra
Tiny Hawaiian shrimp that thrives on neglect in brackish anchialine pools.
Opsarius ardens
FishBarilius ardens
A fast-moving Western Ghats minnow that needs space, speed, and bold companions.
Opsarius malabaricus
FishBarilius malabaricus
A fast, bold river minnow from India's Western Ghats that needs room to move.
Oranda Goldfish
FishCarassius auratus var. oranda
The velvet-capped fancy goldfish that rewards patient, attentive keeping.
Orange Ball Anemone
CoralPseudocorynactis caribbeorum
A nocturnal Caribbean predator with sticky orange-tipped tentacles that can snag small fish.
Orange Chromide
FishEtroplus maculatus
The only cichlid native to India, with a fascinating cleaning-fish side hustle.
Orange Ctenopoma
FishMicroctenopoma ansorgii
A jewel-toned African labyrinth fish that rewards patient, experienced keepers.
Orange Cup Coral
CoralBalanophyllia (Balanophyllia) elegans
A vivid cold-water coral that thrives in the shade where most corals fail.
Orange Cup Coral
CoralTubastraea columnata
A bold, non-photosynthetic coral that rewards patient target feeders with vivid blooms.
Orange Cup Coral
CoralTubastraea grandidentata
A non-photosynthetic branching coral that thrives in dim, current-swept reef spots.
Orange dwarf toothcarp
FishNeoheterandria elegans
A tiny Colombian livebearer with a fascinating near-mammalian reproductive twist.
Orange Encrusting Anemone
CoralEpizoanthus scotinus
A cold-water Pacific zoanthid that brings bold orange color to cooler reef tanks.