Species
Browsing 1,789 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.
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-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.
Oranda Goldfish
FishCarassius auratus var. oranda
The velvet-capped fancy goldfish that rewards patient, attentive keeping.
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 Encrusting Anemone
CoralEpizoanthus scotinus
A cold-water Pacific zoanthid that brings bold orange color to cooler reef tanks.
Orangefin Anemonefish
FishAmphiprion chrysopterus
A large, bold anemonefish from the wide Pacific with serious territorial attitude.
Orange-fin Barb
FishBarbus eutaenia
A sleek African barb from fast, rocky streams that rewards patient keepers.
Orangefin Tetra
FishBryconops affinis
A restless, fast-moving shoaler from the Guiana Shield's coastal streams.
Orangestriped Triggerfish
FishBalistapus undulatus
One of the reef's most aggressive personalities packed into a boldly patterned body.
Orange Sun Coral
CoralTubastraea megalostoma
A bold, non-photosynthetic coral that thrives in low light and rewards dedicated feeders.
Orange Sun Coral
CoralTubastraea ramosa
A brilliant non-photosynthetic branching coral that thrives in the dark.
Orange Tree Coral
CoralDendrophyllia ramea
A branching azooxanthellate coral that thrives in dim, current-swept Atlantic waters.
Orchid Dottyback
FishPseudochromis fridmani
A bold little Red Sea endemic that punches well above its weight.
Orinoco Eartheater
FishBiotodoma wavrini
A slender eartheater that thrives in groups and rewards patient, experienced keepers.
Orinoco Tetra
FishHemigrammus barrigonae
A rare Orinoco tetra that rewards patient keepers willing to seek it out.
Ornate Bichir
FishPolypterus ornatipinnis
An ancient, armored predator that breathes air and prowls the night.
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.
Oscar
FishAstronotus ocellatus
The cichlid that recognizes your face and rearranges its own tank.
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 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.
Painted Frogfish
FishAntennarius pictus
A master of disguise that hunts with a built-in fishing rod.