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Species

Browsing 1,789 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.

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-stripe Anthias

One-stripe Anthias

Fish

Pseudanthias fasciatus

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

One-stripe Spiny Eel

One-stripe Spiny Eel

Fish

Macrognathus aculeatus

A serpentine burrower with a single bold stripe and a secretive personality.

Oranda Goldfish

Oranda Goldfish

Fish

Carassius auratus var. oranda

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

Orange Chromide

Orange Chromide

Fish

Etroplus maculatus

The only cichlid native to India, with a fascinating cleaning-fish side hustle.

Orange Ctenopoma

Orange Ctenopoma

Fish

Microctenopoma ansorgii

A jewel-toned African labyrinth fish that rewards patient, experienced keepers.

Orange Cup Coral

Orange Cup Coral

Coral

Balanophyllia (Balanophyllia) elegans

A vivid cold-water coral that thrives in the shade where most corals fail.

Orange Cup Coral

Orange Cup Coral

Coral

Tubastraea columnata

A bold, non-photosynthetic coral that rewards patient target feeders with vivid blooms.

Orange Cup Coral

Orange Cup Coral

Coral

Tubastraea grandidentata

A non-photosynthetic branching coral that thrives in dim, current-swept reef spots.

Orange Encrusting Anemone

Orange Encrusting Anemone

Coral

Epizoanthus scotinus

A cold-water Pacific zoanthid that brings bold orange color to cooler reef tanks.

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.

Orangefin Tetra

Orangefin Tetra

Fish

Bryconops affinis

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

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.

Orinoco Eartheater

Orinoco Eartheater

Fish

Biotodoma wavrini

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

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.

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 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.

Painted Frogfish

Painted Frogfish

Fish

Antennarius pictus

A master of disguise that hunts with a built-in fishing rod.