Species
Browsing 1,329 species. Use the filters below to narrow down.
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 Mouthbrooder
FishBetta unimaculata
A mouthbrooding Betta from Borneo that bucks the aggressive stereotype entirely.
One-stripe Anthias
FishPseudanthias fasciatus
A deep-reef anthias famous for swimming upside-down along cave ceilings.
Opae Ula
InvertHalocaridina rubra
Tiny Hawaiian shrimp that thrives on neglect in brackish anchialine pools.
Oranda Goldfish
FishCarassius auratus var. oranda
The velvet-capped fancy goldfish that rewards patient, attentive keeping.
Orange-fin Barb
FishBarbus eutaenia
A sleek African barb from fast, rocky streams that rewards patient keepers.
Orange-fin Stiphodon
FishStiphodon maculidorsalis
A tiny Indonesian stream goby with bold dorsal markings worth seeking out.
Orangefin Tetra
FishBryconops affinis
A restless, fast-moving shoaler from the Guiana Shield's coastal streams.
Orangeflossen
FishLaetacara fulvipinnis
A tiny blackwater cichlid with warm-toned fins and a gentle personality.
Orange Poso Rabbit Snail
InvertTylomelania gemmifera
A slow-moving, long-lived freshwater snail with a face only a hobbyist could love.
Orangespine Unicornfish
FishNaso elegans
A bold reef grazer with vivid orange tail spines and a distinctly regal profile.
Orangespot Surgeonfish
FishAcanthurus olivaceus
A bold orange shoulder-stripe makes this reef surgeon impossible to mistake.
Orchid Island Goby
FishRhinogobius lanyuensis
A tiny island goby from one of Taiwan's most remote corners.
Orinoco sailfin catfish
FishPterygoplichthys multiradiatus
A dinosaur-sized algae grazer built for decades of service in large tanks.
Orinoco Tetra
FishHemigrammus barrigonae
A rare Orinoco tetra that rewards patient keepers willing to seek it out.
Ornate Corydoras
FishCorydoras ornatus
A long-lived Tapajós bottom-dweller that thrives in sociable, peaceful groups.
Ornate Paradisefish
FishMalpulutta kretseri
A rare Sri Lankan gem that deserves a species tank all to itself.
Ornate rainbowfish
FishRhadinocentrus ornatus
A tiny Australian rainbowfish from wild, tea-stained wallum streams.
Otocinclus
FishOtocinclus vittatus
Tiny algae-grazing catfish that plasters itself to glass and plants alike.
Otocinclus affinis
FishMacrotocinclus affinis
Tiny Brazilian algae-eater with a habit of resting right on the front glass.
Otocinclus Catfish (Tank-Bred)
FishOtocinclus macrospilus
The most commonly sold oto, fragile at first but rewarding once settled.
Otocinclus cocama
FishA tiny Peruvian algae grazer with bold, zebra-like blotches and a gentle disposition.
Oyapock Cory
FishCorydoras condiscipulus
A long-lived Oyapock armored catfish that breathes air and blinks its eyes.
Pacific Double-saddle Butterflyfish
FishChaetodon ulietensis
A boldly patterned butterflyfish that pairs for life in the wild.
Pacific Molly
FishPoecilia butleri
A personable little livebearer that grazes algae and practically eats from your hand.
Pacific Sea Fan
CoralPacifigorgia dampieri
A bold Pacific sea fan that rewards patient, experienced reef keepers with high flow.
Pacific Seahorse
FishHippocampus procerus
A tall-crowned Pacific seahorse that rewards patient, attentive keepers.
Pacific Sea Nettle
InvertChrysaora fuscescens
A striking open-water predator that demands a very specialized setup.
Pacu
FishPiaractus mesopotamicus
A seed-crunching giant from South American floodplains that outgrows almost any home aquarium.
Pajama cardinalfish
FishSphaeramia nematoptera
Polka dots, bold racing stripe, and calm enough for any peaceful community reef.
Palauan Riffle Goby
FishStiphodon pelewensis
A tiny riffle-dweller that vanishes into the sand when startled.
Palespotted Corydoras
FishCorydoras gossei
A long-lived, peaceful bottom dweller that breathes air and blinks its eyes.
Panda Barb
FishHaludaria melanampyx
A lively hill-stream barb from India's Western Ghats with a two-tone shimmer.