Asia
Siamese fighting fish
Betta splendens var.
Temp24–30°C
pH6–8
Size6.5 cm
DietCarnivore
Swim—
DifficultyModerate
Siamese fighting fish
Betta splendens var.
Starting Small? Find the perfect fish for your nano tank.
Showing fish with recommended minimum tank size up to 10 gallon.
Nano-safe
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
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
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
Nano-safe
Asia
Siamese fighting fish
Betta splendens
Temp24–30°C
pH6–8
Size6.5 cm
DietOmnivore
Swim—
DifficultyModerate
Siamese fighting fish
Betta splendens
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
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
Nano-safe
Asia
Least rasbora
Boraras urophthalmoides
Temp24–28°C
pH6–7
Size4 cm
DietOmnivore
Swim—
DifficultyEasy
Least rasbora
Boraras urophthalmoides
Nano-safe
South America
Ember tetra
Hyphessobrycon amandae
Temp24–28°C
pH6–7
Size2 cm
DietOmnivore
Swim—
DifficultyModerate
Ember tetra
Hyphessobrycon amandae
Nano-safe
Asia
Japanese rice fish
Oryzias latipes
Temp5–30°C
pH7–8
Size4 cm
DietOmnivore
Swim—
DifficultyModerate
Japanese rice fish
Oryzias latipes
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
Nano-safe
Asia
Chili Rasbora
Boraras brigittae
Temp24–28°C
pH6.5–7
Size3.5 cm
DietOmnivore
Swim—
DifficultyEasy
Chili Rasbora
Boraras brigittae
Nano-safe
Asia
Strawberry Rasbora
Boraras naevus
Temp24–28°C
pH5–6.5
Size1.3 cm
DietOmnivore
Swim—
DifficultyEasy
Strawberry Rasbora
Boraras naevus
Nano-safe
Asia
Scarlet badis
Dario dario
Temp18–26°C
pH6.5–8.5
Size1.5 cm
DietCarnivore
Swim—
DifficultyModerate
Scarlet badis
Dario dario
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
Nano-safe
Asia
Dwarf rasbora
Boraras maculatus
Temp24–28°C
pH5–6
Size2.5 cm
DietOmnivore
Swim—
DifficultyModerate
Dwarf rasbora
Boraras maculatus
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
Nano-safe
South America
Endlers guppy
Poecilia wingei
Temp24–30°C
pH7–8.5
Size2 cm
DietOmnivore
Swim—
DifficultyEasy
Endlers guppy
Poecilia wingei
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
Nano-safe
Asia
Asian Stone Catfish
Hara jerdoni
Temp18–24°C
pH6–7.5
Size4 cm
DietOmnivore
Swim—
DifficultyModerate
Asian Stone Catfish
Hara jerdoni
Nano-safe
South America
Pygmy corydoras
Corydoras pygmaeus
Temp22–26°C
pH6–8
Size2.1 cm
DietOmnivore
Swim—
DifficultyEasy
Pygmy corydoras
Corydoras pygmaeus
Nano-safe
Asia
Pygmy gourami
Trichopsis pumila
Temp24–28°C
pH6–7
Size4 cm
DietOmnivore
Swim—
DifficultyModerate
Pygmy gourami
Trichopsis pumila
Nano-safe
Africa
Banded panchax
Pseudepiplatys annulatus
Temp23–26°C
pH6.5–7
Size4 cm
DietInsectivore
Swim—
DifficultyModerate
Banded panchax
Pseudepiplatys annulatus
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
Nano-safe
Africa
Multies
Neolamprologus multifasciatus
Temp24–27°C
pH8–9
Size4 cm
DietOmnivore
Swim—
DifficultyModerate
Multies
Neolamprologus multifasciatus
Nano-safe
Asia
Snakehead Betta
Betta channoides
Temp24–28°C
pH5–6.5
Size2 cm
DietCarnivore
Swim—
DifficultyModerate
Snakehead Betta
Betta channoides
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
Nano-safe
Asia
Crescent betta
Betta imbellis
Temp20–28°C
pH6–7
Size6 cm
DietCarnivore
Swim—
DifficultyModerate
Crescent betta
Betta imbellis
Nano-safe
Asia
Malabar pufferfish
Carinotetraodon travancoricus
Temp22–26°C
pH7.5–8.3
Size3.5 cm
DietOmnivore
Swim—
DifficultyExpert
Malabar pufferfish
Carinotetraodon travancoricus
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
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
Nano-safe
Asia
Galaxy rasbora
Danio margaritatus
Temp20–26°C
pH6.5–7.5
Size2.1 cm
DietOmnivore
Swim—
DifficultyEasy
Galaxy rasbora
Danio margaritatus
Nano-safe
Asia
Emerald Dwarf Rasbora
Danio erythromicron
Temp20–24°C
pH7–8
Size3 cm
DietOmnivore
Swim—
DifficultyEasy
Emerald Dwarf Rasbora
Danio erythromicron
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
Nano-safe
South America
Guppy
Poecilia reticulata
Temp22–28°C
pH7–8
Size5 cm
DietOmnivore
Swim—
DifficultyEasy
Guppy
Poecilia reticulata
Nano-safe
Asia
Microdevario
Microdevario microphthalma
Temp20–26°C
pH6.5–7.5
Size2.6 cm
DietInsectivore
Swim—
DifficultyEasy
Microdevario
Microdevario microphthalma
Nano-safe
Asia
Javanese ricefish
Oryzias javanicus
Temp22–28°C
pH7.5–8.5
Size4.5 cm
DietOmnivore
Swim—
DifficultyModerate
Javanese ricefish
Oryzias javanicus
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.