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Species

Browsing 1,329 species. Use the filters below to narrow down.

Olive danio

Olive danio

Fish

Danio dangila

A large, active danio with impressively long barbels and a rarely seen wild side.

Olive Nerite Snail

Olive Nerite Snail

Invert

Neritina reclivata

A tough little algae grazer that thrives where fresh and salt water meet.

One-lined Pencilfish

One-lined Pencilfish

Fish

Nannostomus unifasciatus

A tiny pencilfish that swims at a permanent angle, day and night.

Oneline Tetra

Oneline Tetra

Fish

Nannaethiops unitaeniatus

A peaceful little African schooler that deserves far more attention than it gets.

One Spot Mouthbrooder

One Spot Mouthbrooder

Fish

Betta unimaculata

A mouthbrooding Betta from Borneo that bucks the aggressive stereotype entirely.

One-stripe Anthias

One-stripe Anthias

Fish

Pseudanthias fasciatus

A deep-reef anthias famous for swimming upside-down along cave ceilings.

Opae Ula

Opae Ula

Invert

Halocaridina rubra

Tiny Hawaiian shrimp that thrives on neglect in brackish anchialine pools.

Oranda Goldfish

Oranda Goldfish

Fish

Carassius auratus var. oranda

The velvet-capped fancy goldfish that rewards patient, attentive keeping.

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 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.

Orchid Island Goby

Orchid Island Goby

Fish

Rhinogobius lanyuensis

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

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 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.

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.

Oyapock Cory

Oyapock Cory

Fish

Corydoras condiscipulus

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

Pacific Double-saddle Butterflyfish

Pacific Double-saddle Butterflyfish

Fish

Chaetodon ulietensis

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

Pacific Molly

Pacific Molly

Fish

Poecilia butleri

A personable little livebearer that grazes algae and practically eats from your hand.

Pacific Sea Fan

Pacific Sea Fan

Coral

Pacifigorgia dampieri

A bold Pacific sea fan that rewards patient, experienced reef keepers with high flow.

Pacific Seahorse

Pacific Seahorse

Fish

Hippocampus procerus

A tall-crowned Pacific seahorse that rewards patient, attentive keepers.

Pacific Sea Nettle

Pacific Sea Nettle

Invert

Chrysaora fuscescens

A striking open-water predator that demands a very specialized setup.

Pacu

Pacu

Fish

Piaractus mesopotamicus

A seed-crunching giant from South American floodplains that outgrows almost any home aquarium.

Pajama cardinalfish

Pajama cardinalfish

Fish

Sphaeramia nematoptera

Polka dots, bold racing stripe, and calm enough for any peaceful community reef.

Palauan Riffle Goby

Palauan Riffle Goby

Fish

Stiphodon pelewensis

A tiny riffle-dweller that vanishes into the sand when startled.

Palespotted Corydoras

Palespotted Corydoras

Fish

Corydoras gossei

A long-lived, peaceful bottom dweller that breathes air and blinks its eyes.

Panda Barb

Panda Barb

Fish

Haludaria melanampyx

A lively hill-stream barb from India's Western Ghats with a two-tone shimmer.