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Species

Browsing 3,374 species. Use the filters below to narrow down.

Orangefin Anemonefish

Orangefin Anemonefish

Fish

Amphiprion chrysopterus

A large, bold anemonefish from the wide Pacific with serious territorial attitude.

Orange-fin Barb

Orange-fin Barb

Fish

Barbus eutaenia

A sleek African barb from fast, rocky streams that rewards patient keepers.

Orange-fin Stiphodon

Orange-fin Stiphodon

Fish

Stiphodon maculidorsalis

A tiny Indonesian stream goby with bold dorsal markings worth seeking out.

Orangefin Tetra

Orangefin Tetra

Fish

Bryconops affinis

A restless, fast-moving shoaler from the Guiana Shield's coastal streams.

Orangeflossen

Orangeflossen

Fish

Laetacara fulvipinnis

A tiny blackwater cichlid with warm-toned fins and a gentle personality.

Orange Head

Orange Head

Fish

Geophagus sp. "Orange Head"

A vividly capped cichlid that rewards patient keepers with fascinating mouthbrooding family life.

Orange Poso Rabbit Snail

Orange Poso Rabbit Snail

Invert

Tylomelania gemmifera

A slow-moving, long-lived freshwater snail with a face only a hobbyist could love.

Orangespine Unicornfish

Orangespine Unicornfish

Fish

Naso elegans

A bold reef grazer with vivid orange tail spines and a distinctly regal profile.

Orangespot Surgeonfish

Orangespot Surgeonfish

Fish

Acanthurus olivaceus

A bold orange shoulder-stripe makes this reef surgeon impossible to mistake.

Orangestriped Triggerfish

Orangestriped Triggerfish

Fish

Balistapus undulatus

One of the reef's most aggressive personalities packed into a boldly patterned body.

Orange Sun Coral

Orange Sun Coral

Coral

Tubastraea megalostoma

A bold, non-photosynthetic coral that thrives in low light and rewards dedicated feeders.

Orange Sun Coral

Orange Sun Coral

Coral

Tubastraea ramosa

A brilliant non-photosynthetic branching coral that thrives in the dark.

Orange Tree Coral

Orange Tree Coral

Coral

Dendrophyllia ramea

A branching azooxanthellate coral that thrives in dim, current-swept Atlantic waters.

Orchid Dottyback

Orchid Dottyback

Fish

Pseudochromis fridmani

A bold little Red Sea endemic that punches well above its weight.

Orchid Island Goby

Orchid Island Goby

Fish

Rhinogobius lanyuensis

A tiny island goby from one of Taiwan's most remote corners.

Orinoco

Orinoco

Fish

Andinoacara sp. "Orinoco"

A mellow Orinoco cichlid that pairs easily and rewards patient breeders.

Orinoco Eartheater

Orinoco Eartheater

Fish

Biotodoma wavrini

A slender eartheater that thrives in groups and rewards patient, experienced keepers.

Orinoco sailfin catfish

Orinoco sailfin catfish

Fish

Pterygoplichthys multiradiatus

A dinosaur-sized algae grazer built for decades of service in large tanks.

Orinoco Tetra

Orinoco Tetra

Fish

Hemigrammus barrigonae

A rare Orinoco tetra that rewards patient keepers willing to seek it out.

Ornate Bichir

Ornate Bichir

Fish

Polypterus ornatipinnis

An ancient, armored predator that breathes air and prowls the night.

Ornate Corydoras

Ornate Corydoras

Fish

Corydoras ornatus

A long-lived Tapajós bottom-dweller that thrives in sociable, peaceful groups.

Ornate Paradisefish

Ornate Paradisefish

Fish

Malpulutta kretseri

A rare Sri Lankan gem that deserves a species tank all to itself.

Ornate rainbowfish

Ornate rainbowfish

Fish

Rhadinocentrus ornatus

A tiny Australian rainbowfish from wild, tea-stained wallum streams.

Oscar

Oscar

Fish

Astronotus ocellatus

The cichlid that recognizes your face and rearranges its own tank.

Otjikoto Tilapia

Otjikoto Tilapia

Fish

Tilapia guinasana

A critically endangered sinkhole cichlid with wild color variation and devoted parental care.

Otocinclus

Otocinclus

Fish

Otocinclus vittatus

Tiny algae-grazing catfish that plasters itself to glass and plants alike.

Otocinclus affinis

Otocinclus affinis

Fish

Macrotocinclus affinis

Tiny Brazilian algae-eater with a habit of resting right on the front glass.

Otocinclus Catfish (Tank-Bred)

Otocinclus Catfish (Tank-Bred)

Fish

Otocinclus macrospilus

The most commonly sold oto, fragile at first but rewarding once settled.

Otocinclus cocama

Otocinclus cocama

Fish

A tiny Peruvian algae grazer with bold, zebra-like blotches and a gentle disposition.

Oval Mushroom Coral

Oval Mushroom Coral

Coral

Lobactis scutaria

A hardy, low-demand coral that brings bold texture to any reef.

Oyapock Cory

Oyapock Cory

Fish

Corydoras condiscipulus

A long-lived Oyapock armored catfish that breathes air and blinks its eyes.

Oyapock Eartheater

Oyapock Eartheater

Fish

Geophagus camopiensis

A rarely seen eartheater with elaborate mouthbrooding behavior and real personality.

Ozelot

Ozelot

Plant

Echinodorus 'Ozelot'

A beginner-friendly rosette plant that keeps its leopard spots even in low light.

Ozelot Green

Ozelot Green

Plant

Echinodorus 'Ozelot Green'

A bold rosette plant with spotted leaves that thrives even under low light.

Pacific Double-saddle Butterflyfish

Pacific Double-saddle Butterflyfish

Fish

Chaetodon ulietensis

A boldly patterned butterflyfish that pairs for life in the wild.

Pacific Fat Sleeper

Pacific Fat Sleeper

Fish

Dormitator latifrons

A chunky estuarine predator that breathes air and swallows anything it can fit in its mouth.