Aquariumpro
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🌱Nano tank friendly

Species that stay small enough to thrive in tanks under 20 gallons. Perfect for desktop setups, planted nanos, and pico reefs.

323 species

Nijssen's cory
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Nijssen's cory

Fish

Corydoras nijsseni

A rare Rio Negro cory with bold patterning and a surprisingly long lifespan.

Norman's Lampeye

Norman's Lampeye

Fish

Poropanchax normani

Tiny West African killifish with glowing blue eyes that shimmer in low light.

Northern longsnose cory

Northern longsnose cory

Fish

Corydoras septentrionalis

A long-lived Orinoco bottom-dweller that breathes air and blinks at you.

Okinawa Goby

Okinawa Goby

Fish

Gobiodon okinawae

Tiny, vivid, and inseparable from its Acropora home.

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.

Orchid Island Goby

Orchid Island Goby

Fish

Rhinogobius lanyuensis

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

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 Catfish (Tank-Bred)

Otocinclus Catfish (Tank-Bred)

Fish

Otocinclus macrospilus

The most commonly sold oto, fragile at first but rewarding once settled.

Otocinclus cocama
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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.

Panda Cory

Panda Cory

Fish

Corydoras panda

The panda-patterned cory that's as personable as it is peaceful.

Peaceful Betta

Peaceful Betta

Fish

Betta imbellis

The gentler betta. Males can sometimes share a tank if given enough cover.

Pelvic-spot Wrasse

Pelvic-spot Wrasse

Fish

Pseudocheilinops ataenia

A tiny, secretive reef wrasse that vanishes into the coral the moment you look away.

Pencilfish
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Pencilfish

Fish

Nannostomus grandis

The largest pencilfish, rarely seen but worth the search.

Pencilfish
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Pencilfish

Fish

Nannostomus minimus

Tiny, timid, and barely an inch long. A pencilfish for the dedicated nano keeper.

Pentazona Barb

Pentazona Barb

Fish

Desmopuntius hexazona

A dainty six-banded barb that thrives in big, lively groups

Peruvian Tetra

Peruvian Tetra

Fish

Hyphessobrycon peruvianus

A slender Upper Amazon tetra often misidentified but worth tracking down properly.

Petracini's cory

Petracini's cory

Fish

Corydoras petracinii

A tiny Argentine cory built for rocky currents, rarely if ever seen in the hobby.

Picotee Livebearer
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Picotee Livebearer

Fish

Phallichthys fairweatheri

A gentle little livebearer from Central America's marshy backwaters.

Pigmy Synodontis
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Pigmy Synodontis

Fish

Microsynodontis polli

A tiny, peaceful African catfish that fits where most synodontis never could.

Polka Dot Cory
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Polka Dot Cory

Fish

Corydoras polystictus

A tiny armored catfish that thrives in groups and breathes air when it needs to.

Pookode Lake Barb
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Pookode Lake Barb

Fish

Pethia pookodensis

A rare gem from a single Indian lake, perfect for peaceful community tanks.

Puntius Sp. Pearlscale

Puntius Sp. Pearlscale

Fish

Pethia stoliczkana

A peaceful schooling barb from mainland Southeast Asia, best kept in numbers.

Purple Oil Catfish
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Purple Oil Catfish

Fish

Centromochlus reticulatus

A tiny gregarious catfish from Guyana that sometimes goes by 'purple oil catfish'.

Purple Pencilfish

Purple Pencilfish

Fish

Nannostomus rubrocaudatus

Tiny, territorial, and blazing with red-purple color. A pencilfish with real attitude.

Pygmy Cory

Pygmy Cory

Fish

Corydoras pygmaeus

Tiny catfish that defies expectations by schooling in open water, not just the bottom.

Pygmy Hatchetfish

Pygmy Hatchetfish

Fish

Carnegiella myersi

Tiny, delicate, and built for the surface. The smallest hatchetfish of them all.

Pygmy Rasbora

Pygmy Rasbora

Fish

Boraras maculatus

A pea-sized schooling fish that rewards patience with dazzling group displays.

Pygmy Swordtail

Pygmy Swordtail

Fish

Xiphophorus pygmaeus

A pint-sized livebearer with all the personality of its larger swordtail cousins.

Red Barred Killi

Red Barred Killi

Fish

Aphyosemion elberti

A small, manageable killifish with bold markings from Central African stream systems.

Redbreast Acara

Redbreast Acara

Fish

Laetacara dorsigera

A tiny South American cichlid with a boldly colored chest and a gentle personality.

Red Dwarf Rasbora
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Red Dwarf Rasbora

Fish

Microrasbora rubescens

A tiny Lake Inle gem that truly shines when kept in a proper-sized school.

Redfin Two-banded Carplet

Redfin Two-banded Carplet

Fish

Pethia reval

A tiny Sri Lankan barb with vivid red fins and an easy-going nature.