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Species

Browsing 2,796 species. Use the filters below to narrow down.

Javan Ricefish

Javan Ricefish

Fish

Oryzias javanicus

A surface-dwelling ricefish with surprisingly complex spawning behavior, rarely seen for sale.

Jello Band Catfish

Jello Band Catfish

Fish

Aguarunichthys torosus

A powerfully built Peruvian catfish that treats smaller tankmates as a meal.

Jelly Bean Tetra

Jelly Bean Tetra

Fish

Ladigesia roloffi

A tiny West African gem that thrives in groups and rewards patient keepers.

Jerdon's Baril

Jerdon's Baril

Fish

Barilius canarensis

A bold, fast-moving schooler from Indian hill streams that needs equally spirited tankmates.

Jewel Anemone

Jewel Anemone

Coral

Corynactis viridis

A not-quite-anemone that paints rocky walls in vivid clusters

Jewel Cichlid

Jewel Cichlid

Fish

Hemichromis bimaculatus

Gorgeous West African cichlid that becomes a ferocious defender once paired up.

Joker's Boomerang Coral

Joker's Boomerang Coral

Coral

Polyphyllia novaehiberniae

A free-roaming, boomerang-shaped coral that extends its tentacles even in daylight.

Jonklaas's Loach

Jonklaas's Loach

Fish

Lepidocephalichthys jonklaasi

A rare Sri Lankan loach hidden beneath leaf litter, seldom seen in the hobby.

Julii Cory

Julii Cory

Fish

Corydoras julii

A spotted little catfish that blinks, breathes air, and belongs in every peaceful community.

Julii Cory

Julii Cory

Fish

Corydoras trilineatus

Commonly sold as julii cory, this peaceful armored catfish is a beginner-friendly gem.

Jumbo Cory

Jumbo Cory

Fish

Corydoras multiradiatus

A large, long-snouted cory with a fascinating air-breathing trick up its sleeve.

Kabili Bumblebee Goby

Kabili Bumblebee Goby

Fish

Brachygobius kabiliensis

Tiny bumblebee-patterned goby from Borneo's mangroves, surprisingly manageable for new keepers.

Kamaka Rainbowfish

Kamaka Rainbowfish

Fish

Melanotaenia kamaka

A vividly colored rainbowfish with the active personality to match its appearance.

Kampango

Kampango

Fish

Bagrus meridionalis

A giant Lake Malawi catfish with one of the most complex social lives in freshwater.

Kane's cory

Kane's cory

Fish

Corydoras kanei

A small, spotted cory from blackwater rivers that breathes air and charms beginners.

Karnataka Labeo

Karnataka Labeo

Fish

Labeo calbasu

A large, algae-grazing river fish best appreciated outside the home aquarium.

Katvis

Katvis

Fish

Pimelodus ornatus

A bold, predatory catfish with toxic spines and serious schooling instincts.

Kenyi Cichlid

Kenyi Cichlid

Fish

Pseudotropheus lombardoi

A notoriously aggressive mbuna with a dramatic reverse color scheme between sexes.

Keyhole angelfish

Keyhole angelfish

Fish

Centropyge tibicen

The biggest dwarf angel, dressed in bold black with a single white patch.

Keyhole Cichlid

Keyhole Cichlid

Fish

Cleithracara maronii

A gentle, shy cichlid whose camouflage trick is straight out of a nature documentary.

Killifish

Killifish

Fish

Austrolebias adloffi

A tiny annual killifish that races through its entire life cycle in months.

King Angelfish

King Angelfish

Fish

Holacanthus passer

A bold Eastern Pacific angel with a single dramatic white stripe across its flank.

King Conch

King Conch

Invert

Aliger gigas

A gentle giant of the seafloor, with one of the most iconic shells in the ocean.

Kissing Gourami

Kissing Gourami

Fish

Helostoma temminkii

The infamous 'kissing fish' hides a complicated personality behind its pucker.

Kissing Prochilodus

Kissing Prochilodus

Fish

Semaprochilodus insignis

A migratory Amazon grazer that plays a surprising ecological role in the wild.

Knife Livebearer

Knife Livebearer

Fish

Alfaro cultratus

A tough little livebearer with a blade-like keel and a feisty personality.

Knobbed Brain Coral

Knobbed Brain Coral

Coral

Pseudodiploria clivosa

A hardy Caribbean brain coral with distinctively ridged, knobby colonies.

Knobby Cactus Coral

Knobby Cactus Coral

Coral

Mycetophyllia aliciae

A hardy Caribbean plate coral with bold texture and an easygoing nature.

Knob Coral

Knob Coral

Coral

Astraeosmilia maxima

A bold, knobby coral from the Indo-Pacific suited to intermediate reef keepers.

Knob Coral

Knob Coral

Coral

Dipsastraea danai

A bottom-dwelling Pacific coral that rewards patient, intermediate-level reef keepers.

Knob Coral

Knob Coral

Coral

Dipsastraea lacuna

A solid, knobby brain coral that rewards patient, steady reef keepers.

Knob Coral

Knob Coral

Coral

Dipsastraea laxa

A rugged Indo-Pacific reef builder with distinctive raised corallites and broad geographic range.

Knob Coral

Knob Coral

Coral

Dipsastraea lizardensis

A tough, knobby reef builder from the broad Indo-Pacific.

Knob Coral

Knob Coral

Coral

Dipsastraea maritima

A rugged, knobby reef builder that rewards patient intermediate keepers.

Knob Coral

Knob Coral

Coral

Dipsastraea marshae

A hardy Indo-Pacific reef builder with distinctive raised coral knobs.

Knob Coral

Knob Coral

Coral

Dipsastraea matthaii

A solid, dependable large polyp stony coral for the intermediate reef keeper.