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Data sources. Sources include FishBase (CC BY-NC), Wikidata (CC0), and other attributed references on species pages where applicable.

Disclaimer. Information is provided for reference only — always cross-check parameters before making decisions that affect livestock.

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Starting Small? Find the perfect fish for your nano tank.

Showing fish with recommended minimum tank size up to 20 gallon.

5 gallon 10 gallon 20 gallon

Nano-safe

Taiwan (selectively bred)

Rili Shrimp

Neocaridina davidi var. rili

Temp18–28°C

pH6.5–8

Size3 cm

DietOmnivore

Swim—

DifficultyEasy

Rili Shrimp

Neocaridina davidi var. rili

Lifespan

2 yr

Schooling

Varies

Aggression

—

Nano-safe

Taiwan (selectively bred)

Blue Velvet Shrimp

Neocaridina davidi var. blue

Temp18–28°C

pH6.5–8

Size3 cm

DietOmnivore

Swim—

DifficultyModerate

Blue Velvet Shrimp

Neocaridina davidi var. blue

Lifespan

2 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Siamese fighting fish

Betta splendens hybrid

Temp24–30°C

pH6–8

Size6.5 cm

DietCarnivore

Swim—

DifficultyEasy

Siamese fighting fish

Betta splendens hybrid

Lifespan

3 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Siamese fighting fish

Betta splendens var.

Temp24–30°C

pH6–8

Size6.5 cm

DietCarnivore

Swim—

DifficultyModerate

Siamese fighting fish

Betta splendens var.

Lifespan

3 yr

Schooling

Varies

Aggression

—

Nano-safe

Taiwan (selectively bred)

Yellow Shrimp

Neocaridina davidi var. yellow

Temp18–28°C

pH6.5–8

Size3 cm

DietOmnivore

Swim—

DifficultyEasy

Yellow Shrimp

Neocaridina davidi var. yellow

Lifespan

2 yr

Schooling

Varies

Aggression

—

Nano-safe

Taiwan (selectively bred from wild Neocaridina davidi)

Cherry Shrimp

Neocaridina davidi

Temp18–28°C

pH6.5–8

Size3 cm

DietOmnivore

Swim—

DifficultyEasy

Cherry Shrimp

Neocaridina davidi

Lifespan

2 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Siamese fighting fish

Betta splendens

Temp24–30°C

pH6–8

Size6.5 cm

DietOmnivore

Swim—

DifficultyModerate

Siamese fighting fish

Betta splendens

Lifespan

3 yr

Schooling

Varies

Aggression

—

Nano-safe

South America

Ember tetra

Hyphessobrycon amandae

Temp24–28°C

pH6–7

Size2 cm

DietOmnivore

Swim—

DifficultyModerate

Ember tetra

Hyphessobrycon amandae

Lifespan

3 yr

Schooling

Varies

Aggression

—

Nano-safe

Southeast Asia (Indonesia, Thailand, Malaysia)

Assassin Snail

Anentome helena

Temp20–28°C

pH6.5–7.5

Size3 cm

DietCarnivore

Swim—

DifficultyExpert

Assassin Snail

Anentome helena

Lifespan

5 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Scarlet badis

Dario dario

Temp18–26°C

pH6.5–8.5

Size1.5 cm

DietCarnivore

Swim—

DifficultyModerate

Scarlet badis

Dario dario

Lifespan

3 yr

Schooling

Varies

Aggression

—

Nano-safe

Southeast Asia (Indonesia, Philippines)

Onion Snail

Vittina olivacea

Temp22–28°C

pH7–8.5

Size3 cm

DietHerbivore

Swim—

DifficultyModerate

Onion Snail

Vittina olivacea

Lifespan

3 yr

Schooling

Varies

Aggression

—

Nano-safe

East Africa (Kenya, Tanzania, Mozambique)

Zebra Nerite

Neritina natalensis

Temp22–28°C

pH7–8.5

Size3 cm

DietHerbivore

Swim—

DifficultyModerate

Zebra Nerite

Neritina natalensis

Lifespan

3 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Japanese rice fish

Oryzias latipes

Temp5–30°C

pH7–8

Size4 cm

DietOmnivore

Swim—

DifficultyModerate

Japanese rice fish

Oryzias latipes

Lifespan

4 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Asian Stone Catfish

Hara jerdoni

Temp18–24°C

pH6–7.5

Size4 cm

DietOmnivore

Swim—

DifficultyModerate

Asian Stone Catfish

Hara jerdoni

Lifespan

5 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Chili Rasbora

Boraras brigittae

Temp24–28°C

pH6.5–7

Size3.5 cm

DietOmnivore

Swim—

DifficultyEasy

Chili Rasbora

Boraras brigittae

Lifespan

3 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Neon Blue Rasbora

Sundadanio axelrodi

Temp23–26°C

pH5–6.5

Size2.3 cm

DietOmnivore

Swim—

DifficultyModerate

Neon Blue Rasbora

Sundadanio axelrodi

Lifespan

3 yr

Schooling

Varies

Aggression

—

Nano-safe

South America

Endlers guppy

Poecilia wingei

Temp24–30°C

pH7–8.5

Size2 cm

DietOmnivore

Swim—

DifficultyEasy

Endlers guppy

Poecilia wingei

Lifespan

3 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Least rasbora

Boraras urophthalmoides

Temp24–28°C

pH6–7

Size4 cm

DietOmnivore

Swim—

DifficultyEasy

Least rasbora

Boraras urophthalmoides

Lifespan

3 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Strawberry Rasbora

Boraras naevus

Temp24–28°C

pH5–6.5

Size1.3 cm

DietOmnivore

Swim—

DifficultyEasy

Strawberry Rasbora

Boraras naevus

Lifespan

3 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Dwarf rasbora

Boraras maculatus

Temp24–28°C

pH5–6

Size2.5 cm

DietOmnivore

Swim—

DifficultyModerate

Dwarf rasbora

Boraras maculatus

Lifespan

3 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Pygmy gourami

Trichopsis pumila

Temp24–28°C

pH6–7

Size4 cm

DietOmnivore

Swim—

DifficultyModerate

Pygmy gourami

Trichopsis pumila

Lifespan

4 yr

Schooling

Varies

Aggression

—

Nano-safe

Africa

Banded panchax

Pseudepiplatys annulatus

Temp23–26°C

pH6.5–7

Size4 cm

DietInsectivore

Swim—

DifficultyModerate

Banded panchax

Pseudepiplatys annulatus

Lifespan

3 yr

Schooling

Varies

Aggression

—

Nano-safe

Africa

Multies

Neolamprologus multifasciatus

Temp24–27°C

pH8–9

Size4 cm

DietOmnivore

Swim—

DifficultyModerate

Multies

Neolamprologus multifasciatus

Lifespan

5 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Emerald Dwarf Rasbora

Danio erythromicron

Temp20–24°C

pH7–8

Size3 cm

DietOmnivore

Swim—

DifficultyEasy

Emerald Dwarf Rasbora

Danio erythromicron

Lifespan

3 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Daisy's Rice Fish

Oryzias woworae

Temp24–28°C

pH6–7

Size2.8 cm

DietOmnivore

Swim—

DifficultyModerate

Daisy's Rice Fish

Oryzias woworae

Lifespan

3 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Malabar pufferfish

Carinotetraodon travancoricus

Temp22–26°C

pH7.5–8.3

Size3.5 cm

DietOmnivore

Swim—

DifficultyExpert

Malabar pufferfish

Carinotetraodon travancoricus

Lifespan

5 yr

Schooling

Varies

Aggression

—

Nano-safe

Sulawesi, Indonesia

Cardinal Shrimp

Caridina dennerli

Temp26–30°C

pH7.5–8.5

Size2.5 cm

DietOmnivore

Swim—

DifficultyModerate

Cardinal Shrimp

Caridina dennerli

Lifespan

2 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Snakehead Betta

Betta channoides

Temp24–28°C

pH5–6.5

Size2 cm

DietCarnivore

Swim—

DifficultyModerate

Snakehead Betta

Betta channoides

Lifespan

3 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

White cloud mountain minnow

Tanichthys albonubes

Temp14–22°C

pH6–8

Size4 cm

DietOmnivore

Swim—

DifficultyEasy

White cloud mountain minnow

Tanichthys albonubes

Lifespan

5 yr

Schooling

Varies

Aggression

—

Nano-safe

South America

Guppy

Poecilia reticulata

Temp22–28°C

pH7–8

Size5 cm

DietOmnivore

Swim—

DifficultyEasy

Guppy

Poecilia reticulata

Lifespan

2 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Microdevario

Microdevario microphthalma

Temp20–26°C

pH6.5–7.5

Size2.6 cm

DietInsectivore

Swim—

DifficultyEasy

Microdevario

Microdevario microphthalma

Lifespan

4 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Javanese ricefish

Oryzias javanicus

Temp22–28°C

pH7.5–8.5

Size4.5 cm

DietOmnivore

Swim—

DifficultyModerate

Javanese ricefish

Oryzias javanicus

Lifespan

3 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Mugilogobius

Mugilogobius hitam

Temp24–28°C

pH7–8

Size4.3 cm

DietInsectivore

Swim—

DifficultyExpert

Mugilogobius

Mugilogobius hitam

Lifespan

3 yr

Schooling

Varies

Aggression

—

Nano-safe

South America

Pygmy corydoras

Corydoras pygmaeus

Temp22–26°C

pH6–8

Size2.1 cm

DietOmnivore

Swim—

DifficultyEasy

Pygmy corydoras

Corydoras pygmaeus

Lifespan

3 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

White Seam Betta

Betta albimarginata

Temp24–28°C

pH5–6.5

Size2.8 cm

DietOmnivore

Swim—

DifficultyModerate

White Seam Betta

Betta albimarginata

Lifespan

3 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Crescent betta

Betta imbellis

Temp20–28°C

pH6–7

Size6 cm

DietCarnivore

Swim—

DifficultyModerate

Crescent betta

Betta imbellis

Lifespan

3 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Gold Ring Danio

Danio tinwini

Temp22–26°C

pH6.5–7.5

Size2.2 cm

DietOmnivore

Swim—

DifficultyModerate

Gold Ring Danio

Danio tinwini

Lifespan

4 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Galaxy rasbora

Danio margaritatus

Temp20–26°C

pH6.5–7.5

Size2.1 cm

DietOmnivore

Swim—

DifficultyEasy

Galaxy rasbora

Danio margaritatus

Lifespan

3 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Zebra danio

Danio rerio

Temp—

pH6–8

Size3.8 cm

DietOmnivore

Swim—

DifficultyEasy

Zebra danio

Danio rerio

Lifespan

5 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Dwarf gourami

Trichogaster lalius

Temp22–28°C

pH6–8

Size9.5 cm

DietOmnivore

Swim—

DifficultyModerate

Dwarf gourami

Trichogaster lalius

Lifespan

4 yr

Schooling

Varies

Aggression

—

Nano-safe

Oceania

Honey blue eye

Pseudomugil mellis

Temp24–28°C

pH6–8

Size3.5 cm

DietOmnivore

Swim—

DifficultyModerate

Honey blue eye

Pseudomugil mellis

Lifespan

3 yr

Schooling

Varies

Aggression

—

Nano-safe

Japan, Taiwan, Korea

Amano Shrimp

Caridina multidentata

Temp15–27°C

pH6.5–7.5

Size5 cm

DietHerbivore

Swim—

DifficultyEasy

Amano Shrimp

Caridina multidentata

Lifespan

3 yr

Schooling

Varies

Aggression

—

Nano-safe

South America

Neon tetra

Paracheirodon innesi

Temp21–25°C

pH5–7

Size2.5 cm

DietOmnivore

Swim—

DifficultyEasy

Neon tetra

Paracheirodon innesi

Lifespan

5 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Threadfin rainbowfish

Iriatherina werneri

Temp22–30°C

pH6–8

Size4 cm

DietOmnivore

Swim—

DifficultyModerate

Threadfin rainbowfish

Iriatherina werneri

Lifespan

3 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Sawbwa barb

Sawbwa resplendens

Temp20–24°C

pH7–8

Size3 cm

DietOmnivore

Swim—

DifficultyModerate

Sawbwa barb

Sawbwa resplendens

Lifespan

3 yr

Schooling

Varies

Aggression

—

Nano-safe

South America

Glowlight tetra

Hemigrammus erythrozonus

Temp22–28°C

pH6–8

Size3.3 cm

DietOmnivore

Swim—

DifficultyEasy

Glowlight tetra

Hemigrammus erythrozonus

Lifespan

5 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Cobalt Blue Goby

Stiphodon semoni

Temp22–28°C

pH7–8

Size4.6 cm

DietOmnivore

Swim—

DifficultyModerate

Cobalt Blue Goby

Stiphodon semoni

Lifespan

4 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Badis

Badis badis

Temp20–26°C

pH6–8

Size7.1 cm

DietOmnivore

Swim—

DifficultyModerate

Badis

Badis badis

Lifespan

5 yr

Schooling

Varies

Aggression

—

Nano-safe

South America

Black neon tetra

Hyphessobrycon herbertaxelrodi

Temp22–28°C

pH5.5–7.5

Size3.2 cm

DietOmnivore

Swim—

DifficultyEasy

Black neon tetra

Hyphessobrycon herbertaxelrodi

Lifespan

5 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Honey gourami

Trichogaster chuna

Temp22–27°C

pH6–8

Size13.7 cm

DietOmnivore

Swim—

DifficultyModerate

Honey gourami

Trichogaster chuna

Lifespan

4 yr

Schooling

Varies

Aggression

—

Nano-safe

North America (USA, Mexico)

Ghost shrimp

Palaemonetes paludosus

Temp15–27°C

pH6.5–7.5

Size5 cm

DietOmnivore

Swim—

DifficultyModerate

Ghost shrimp

Palaemonetes paludosus

Lifespan

3 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Harlequin rasbora

Trigonostigma heteromorpha

Temp21–28°C

pH5–7

Size5 cm

DietOmnivore

Swim—

DifficultyEasy

Harlequin rasbora

Trigonostigma heteromorpha

Lifespan

5 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Red Cherry Rasbora

Rasbora lacrimula

Temp22–26°C

pH4–7.5

Size3.1 cm

DietInsectivore

Swim—

DifficultyEasy

Red Cherry Rasbora

Rasbora lacrimula

Lifespan

4 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Rhinogobius

Rhinogobius zhoui

Temp15–24°C

pH7–8

Size3.6 cm

DietOmnivore

Swim—

DifficultyModerate

Rhinogobius

Rhinogobius zhoui

Lifespan

3 yr

Schooling

Varies

Aggression

—

Nano-safe

South America

Otocinclus

Otocinclus vittatus

Temp21–26°C

pH6–7.5

Size3.3 cm

DietHerbivore

Swim—

DifficultyEasy

Otocinclus

Otocinclus vittatus

Lifespan

5 yr

Schooling

Varies

Aggression

—

Nano-safe

South America

Zebra Oto

Otocinclus cocama

Temp21–25°C

pH6–7

Size4.4 cm

DietHerbivore

Swim—

DifficultyModerate

Zebra Oto

Otocinclus cocama

Lifespan

5 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Dwarf danio

Danio nigrofasciatus

Temp22–26°C

pH6.5–7

Size3.7 cm

DietOmnivore

Swim—

DifficultyEasy

Dwarf danio

Danio nigrofasciatus

Lifespan

4 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Blue Belly Goby

Stiphodon percnopterygionus

Temp22–28°C

pH7–8

Size3.7 cm

DietOmnivore

Swim—

DifficultyModerate

Blue Belly Goby

Stiphodon percnopterygionus

Lifespan

3 yr

Schooling

Varies

Aggression

—

Nano-safe

Central America

Southern platyfish

Xiphophorus maculatus

Temp22–28°C

pH7–8

Size4 cm

DietOmnivore

Swim—

DifficultyEasy

Southern platyfish

Xiphophorus maculatus

Lifespan

3 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Panda Loach

Yaoshania pachychilus

Temp18–24°C

pH7–8

Size5.8 cm

DietOmnivore

Swim—

DifficultyModerate

Panda Loach

Yaoshania pachychilus

Lifespan

5 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Red Neon Goby

Stiphodon atropurpureus

Temp22–28°C

pH7–8

Size5 cm

DietPlanktivore

Swim—

DifficultyModerate

Red Neon Goby

Stiphodon atropurpureus

Lifespan

4 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Spotted blue-eye

Pseudomugil gertrudae

Temp23–28°C

pH6–6

Size3.8 cm

DietPlanktivore

Swim—

DifficultyModerate

Spotted blue-eye

Pseudomugil gertrudae

Lifespan

3 yr

Schooling

Varies

Aggression

—

Nano-safe

South America

Parotocinclus

Parotocinclus eppleyi

Temp22–26°C

pH6–7

Size3 cm

DietOmnivore

Swim—

DifficultyModerate

Parotocinclus

Parotocinclus eppleyi

Lifespan

5 yr

Schooling

Varies

Aggression

—

Nano-safe

Africa

Gold Shell Dweller

Lamprologus ocellatus

Temp24–27°C

pH8–9

Size5.8 cm

DietOmnivore

Swim—

DifficultyModerate

Gold Shell Dweller

Lamprologus ocellatus

Lifespan

8 yr

Schooling

Varies

Aggression

—

Nano-safe

South America

Cardinal tetra

Paracheirodon axelrodi

Temp23.9–28.9°C

pH4–6

Size3 cm

DietPlanktivore

Swim—

DifficultyEasy

Cardinal tetra

Paracheirodon axelrodi

Lifespan

4 yr

Schooling

Varies

Aggression

—

Nano-safe

Oceania

Desert goby

Chlamydogobius eremius

Temp18–30°C

pH7–8

Size6 cm

DietOmnivore

Swim—

DifficultyModerate

Desert goby

Chlamydogobius eremius

Lifespan

3 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Glowlight Danio

Danio choprae

Temp22–26°C

pH6.5–7.5

Size3.1 cm

DietOmnivore

Swim—

DifficultyModerate

Glowlight Danio

Danio choprae

Lifespan

4 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Cherry barb

Puntius titteya

Temp23–27°C

pH6–8

Size5 cm

DietOmnivore

Swim—

DifficultyModerate

Cherry barb

Puntius titteya

Lifespan

4 yr

Schooling

Varies

Aggression

—

Nano-safe

South America

Panda corydoras

Corydoras panda

Temp22–26°C

pH6–8

Size3.8 cm

DietOmnivore

Swim—

DifficultyEasy

Panda corydoras

Corydoras panda

Lifespan

5 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Chinese Bitterling

Rhodeus sinensis

Temp5–26°C

pH7–8.5

Size10.8 cm

DietOmnivore

Swim—

DifficultyModerate

Chinese Bitterling

Rhodeus sinensis

Lifespan

5 yr

Schooling

Varies

Aggression

—

Nano-safe

South America

Rosy tetra

Hyphessobrycon rosaceus

Temp23.9–27.8°C

pH5.8–7.5

Size3.4 cm

DietOmnivore

Swim—

DifficultyModerate

Rosy tetra

Hyphessobrycon rosaceus

Lifespan

5 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Fiveband barb

Desmopuntius pentazona

Temp23–28°C

pH5–6

Size8.8 cm

DietOmnivore

Swim—

DifficultyModerate

Fiveband barb

Desmopuntius pentazona

Lifespan

5 yr

Schooling

Varies

Aggression

—

Nano-safe

Africa

Blue lyretail

Fundulopanchax gardneri

Temp22–26°C

pH6–7.2

Size6.5 cm

DietOmnivore

Swim—

DifficultyModerate

Blue lyretail

Fundulopanchax gardneri

Lifespan

3 yr

Schooling

Varies

Aggression

—

Nano-safe

South America

Ornate tetra

Hyphessobrycon bentosi

Temp24–28°C

pH5.8–7.5

Size4.3 cm

DietOmnivore

Swim—

DifficultyModerate

Ornate tetra

Hyphessobrycon bentosi

Lifespan

5 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Hillstream loach

Gastromyzon punctulatus

Temp18–24°C

pH6.5–7.5

Size6.5 cm

DietOmnivore

Swim—

DifficultyModerate

Hillstream loach

Gastromyzon punctulatus

Lifespan

5 yr

Schooling

Varies

Aggression

—

Nano-safe

South America

Leopard corydoras

Corydoras julii

Temp22–26°C

pH6–8

Size5.2 cm

DietOmnivore

Swim—

DifficultyEasy

Leopard corydoras

Corydoras julii

Lifespan

5 yr

Schooling

Varies

Aggression

—

Nano-safe

Borneo (Southeast Asia)

Borneo Loach

Pangio shelfordii

Temp24–29°C

pH6–7

Size8 cm

DietOmnivore

Swim—

DifficultyModerate

Borneo Loach

Pangio shelfordii

Lifespan

10 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Checkered barb

Oliotius oligolepis

Temp20–25°C

pH6–6.5

Size5 cm

DietOmnivore

Swim—

DifficultyModerate

Checkered barb

Oliotius oligolepis

Lifespan

5 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Chocolate gourami

Sphaerichthys osphromenoides

Temp25–30°C

pH4–6

Size6 cm

DietOmnivore

Swim—

DifficultyModerate

Chocolate gourami

Sphaerichthys osphromenoides

Lifespan

4 yr

Schooling

Varies

Aggression

—

Nano-safe

South America

Ram cichlid

Mikrogeophagus ramirezi var.

Temp26–30°C

pH5–6

Size4.2 cm

DietOmnivore

Swim—

DifficultyModerate

Ram cichlid

Mikrogeophagus ramirezi var.

Lifespan

3 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Blackline rasbora

Rasbora borapetensis

Temp22–26°C

pH6.5–7

Size10 cm

DietOmnivore

Swim—

DifficultyModerate

Blackline rasbora

Rasbora borapetensis

Lifespan

5 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Chen Hillstream Loach

Pseudogastromyzon cheni

Temp15–24°C

pH6.5–7.5

Size5 cm

DietOmnivore

Swim—

DifficultyModerate

Chen Hillstream Loach

Pseudogastromyzon cheni

Lifespan

5 yr

Schooling

Varies

Aggression

—

Nano-safe

South America

Red phantom tetra

Hyphessobrycon sweglesi

Temp22.2–27.8°C

pH5.5–7.5

Size3.2 cm

DietOmnivore

Swim—

DifficultyModerate

Red phantom tetra

Hyphessobrycon sweglesi

Lifespan

5 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Reticulated hillstream loach

Sewellia lineolata

Temp18–24°C

pH6.5–7.5

Size5.7 cm

DietOmnivore

Swim—

DifficultyModerate

Reticulated hillstream loach

Sewellia lineolata

Lifespan

5 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Blue danio

Danio kerri

Temp22–26°C

pH6.5–7

Size5 cm

DietOmnivore

Swim—

DifficultyEasy

Blue danio

Danio kerri

Lifespan

4 yr

Schooling

Varies

Aggression

—

Nano-safe

South America

Bronze corydoras

Corydoras aeneus

Temp22–26°C

pH6–8

Size7.5 cm

DietOmnivore

Swim—

DifficultyEasy

Bronze corydoras

Corydoras aeneus

Lifespan

5 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Coolie loach

Pangio kuhlii

Temp24–29°C

pH5.5–6.5

Size12 cm

DietOmnivore

Swim—

DifficultyModerate

Coolie loach

Pangio kuhlii

Lifespan

10 yr

Schooling

Varies

Aggression

—

Nano-safe

South America

Silvertip tetra

Hasemania nana

Temp22–28°C

pH6–8

Size3.8 cm

Diet—

Swim—

DifficultyModerate

Silvertip tetra

Hasemania nana

Lifespan

5 yr

Schooling

Varies

Aggression

—

Nano-safe

South America

Twosaddle corydoras

Corydoras weitzmani

Temp22–26°C

pH6–8

Size5 cm

DietOmnivore

Swim—

DifficultyModerate

Twosaddle corydoras

Corydoras weitzmani

Lifespan

5 yr

Schooling

Varies

Aggression

—

Nano-safe

South America

Ram cichlid

Mikrogeophagus ramirezi

Temp27–30°C

pH5–6

Size4.2 cm

DietOmnivore

Swim—

DifficultyModerate

Ram cichlid

Mikrogeophagus ramirezi

Lifespan

3 yr

Schooling

Varies

Aggression

—

Nano-safe

South America

Schwartz's catfish

Corydoras schwartzi

Temp22–26°C

pH6–8

Size3.9 cm

DietOmnivore

Swim—

DifficultyModerate

Schwartz's catfish

Corydoras schwartzi

Lifespan

5 yr

Schooling

Varies

Aggression

—

Nano-safe

Africa

Gold Cap Caudopunctatus

Neolamprologus caudopunctatus

Temp24–27°C

pH7.5–8.5

Size6.5 cm

DietPlanktivore

Swim—

DifficultyModerate

Gold Cap Caudopunctatus

Neolamprologus caudopunctatus

Lifespan

8 yr

Schooling

Varies

Aggression

—

Nano-safe

Oceania

Forktail rainbowfish

Pseudomugil furcatus

Temp—

pH6–8

Size5 cm

DietOmnivore

Swim—

DifficultyModerate

Forktail rainbowfish

Pseudomugil furcatus

Lifespan

3 yr

Schooling

Varies

Aggression

—

Nano-safe

South America

Oxyropsis

Oxyropsis carinata

Temp24–28°C

pH6–7.5

Size7.6 cm

DietOmnivore

Swim—

DifficultyMedium

Oxyropsis

Oxyropsis carinata

Lifespan

5 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Eyespot pufferfish

Tetraodon biocellatus

Temp22.2–26.1°C

pH6.5–7.5

Size8 cm

DietOmnivore

Swim—

DifficultyModerate

Eyespot pufferfish

Tetraodon biocellatus

Lifespan

10 yr

Schooling

Varies

Aggression

—

Nano-safe

South America

Molly

Poecilia sphenops

Temp24–28°C

pH7.5–8.2

Size7.5 cm

DietOmnivore

Swim—

DifficultyModerate

Molly

Poecilia sphenops

Lifespan

5 yr

Schooling

Varies

Aggression

—

Nano-safe

South America

Lemon tetra

Hyphessobrycon pulchripinnis

Temp23–28°C

pH5.5–8

Size3.8 cm

DietOmnivore

Swim—

DifficultyModerate

Lemon tetra

Hyphessobrycon pulchripinnis

Lifespan

5 yr

Schooling

Varies

Aggression

—

Nano-safe

South America

Black phantom tetra

Hyphessobrycon megalopterus

Temp22–26°C

pH6–7.5

Size3.6 cm

DietOmnivore

Swim—

DifficultyModerate

Black phantom tetra

Hyphessobrycon megalopterus

Lifespan

5 yr

Schooling

Varies

Aggression

—

Nano-safe

Asia

Beaufortia

Beaufortia pingi

Temp18–24°C

pH6.5–7.5

Size7.4 cm

DietHerbivore

Swim—

DifficultyModerate

Beaufortia

Beaufortia pingi

Lifespan

6 yr

Schooling

Varies

Aggression

—

Nano-safe

South America

Agassiz's dwarf cichlid

Apistogramma agassizii

Temp23–29°C

pH5–7

Size4.4 cm

DietOmnivore

Swim—

DifficultyModerate

Agassiz's dwarf cichlid

Apistogramma agassizii

Lifespan

5 yr

Schooling

Varies

Aggression

—

Nano-safe

South America

Umbrella cichlid

Apistogramma borellii

Temp20–26°C

pH6–8

Size3.9 cm

DietOmnivore

Swim—

DifficultyModerate

Umbrella cichlid

Apistogramma borellii

Lifespan

5 yr

Schooling

Varies

Aggression

—

Nano-safe

South America

Blackline penguinfish

Thayeria boehlkei

Temp22–28°C

pH6–8

Size3.6 cm

DietOmnivore

Swim—

DifficultyModerate

Blackline penguinfish

Thayeria boehlkei

Lifespan

5 yr

Schooling

Varies

Aggression

—

Nano-safe

South America

Cockatoo cichlid

Apistogramma cacatuoides

Temp22–29°C

pH6–8

Size5 cm

DietOmnivore

Swim—

DifficultyEasy

Cockatoo cichlid

Apistogramma cacatuoides

Lifespan

5 yr

Schooling

Varies

Aggression

—

Nano-safe

South America

Black tetra

Gymnocorymbus ternetzi

Temp20–26°C

pH6–8

Size7.5 cm

DietOmnivore

Swim—

DifficultyEasy

Black tetra

Gymnocorymbus ternetzi

Lifespan

5 yr

Schooling

Varies

Aggression

—

Nano-safe

South America

Jewel tetra

Hyphessobrycon eques

Temp20–28°C

pH5–7.8

Size4 cm

DietOmnivore

Swim—

DifficultyModerate

Jewel tetra

Hyphessobrycon eques

Lifespan

5 yr

Schooling

Varies

Aggression

—

Nano-safe

South America

Head-and-taillight tetra

Hemigrammus ocellifer

Temp22–28°C

pH6–8

Size4.9 cm

DietOmnivore

Swim—

DifficultyModerate

Head-and-taillight tetra

Hemigrammus ocellifer

Lifespan

5 yr

Schooling

Varies

Aggression

—

Best Fish for Nano Tanks

Small aquariums are less forgiving, so prioritize peaceful species with low bioload and stable group behavior.

Match fish to realistic tank volume after substrate and hardscape displacement, not label volume alone.

Keep stocking conservative and maintain consistent water-change routines for long-term stability.