Asia
Asian Stone Catfish
Hara jerdoni
Temp18–24°C
pH5.6–7.6
Size3 cm
DietOmnivore
Swim—
DifficultyModerate
Adult tank12.5 L
Recommended group—
Asian Stone Catfish
Hara jerdoni
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
Asia
Malabar pufferfish
Carinotetraodon travancoricus
Temp22–28°C
pH6.8–8
Size2.5 cm
DietCarnivore
Swim—
DifficultyExpert
Adult tank12.6 L
Recommended group—
Malabar pufferfish
Carinotetraodon travancoricus
Nano-safe
Taiwan (selectively bred from wild Neocaridina davidi)
Cherry Shrimp
Neocaridina davidi
Temp18–28°C
pH6.5–8
Size2.5 cm
DietOmnivore
Swim—
DifficultyEasy
Adult tank19 L
Recommended group—
Cherry Shrimp
Neocaridina davidi
Nano-safe
Asia
Galaxy betta
Betta splendens
Temp22–30°C
pH6–8
Size7 cm
DietCarnivore
Swim—
DifficultyModerate
Adult tank20 L
Recommended group—
Keep males separate; provide steady heat, gentle flow, surface access and a cover.
Galaxy betta
Betta splendens
Lifespan estimate
3 yr
Schooling
Varies
Aggression
—
Keep males separate; provide steady heat, gentle flow, surface access and a cover.
Nano-safe
Asia
Alien betta
Betta splendens hybrid
Temp24–30°C
pH6–7.5
Size6.5 cm
DietCarnivore
Swim—
DifficultyEasy
Adult tank20 L
Recommended group—
Keep males separate, with steady heat, gentle flow, surface access and a cover.
Alien betta
Betta splendens hybrid
Schooling
Varies
Aggression
—
Keep males separate, with steady heat, gentle flow, surface access and a cover.
Nano-safe
Southeast Asia (Indonesia, Thailand, Malaysia)
Assassin Snail
Anentome helena
Temp21–27°C
pH7.2–8
Size3 cm
DietCarnivore
Swim—
DifficultyEasy
Adult tank20 L
Recommended group—
Assassin Snail
Anentome helena
Nano-safe
Asia
Siamese fighting fish
Betta splendens
Temp22–30°C
pH6–8
Size7 cm
DietCarnivore
Swim—
DifficultyModerate
Adult tank20 L
Recommended group—
Keep males separate; provide steady heat, gentle flow, surface access and a cover.
Siamese fighting fish
Betta splendens
Lifespan estimate
3 yr
Schooling
Varies
Aggression
—
Keep males separate; provide steady heat, gentle flow, surface access and a cover.
Nano-safe
East Africa (Kenya, Tanzania, Mozambique)
Zebra Nerite
Vittina natalensis
Temp22–28°C
pH7–8.5
Size2.5 cm
DietHerbivore
Swim—
DifficultyModerate
Adult tank20 L
Recommended group—
Provide algae-covered surfaces and stable water; protect snails from predatory tankmates.
Zebra Nerite
Vittina natalensis
Schooling
Varies
Aggression
—
Provide algae-covered surfaces and stable water; protect snails from predatory tankmates.
Nano-safe
Asia
Least rasbora
Boraras urophthalmoides
Temp24–28°C
pH6–7
Size2 cm
DietOmnivore
Swim—
DifficultyEasy
Adult tank20 L
Recommended group—
Least rasbora
Boraras urophthalmoides
Nano-safe
Asia
White cloud mountain minnow
Tanichthys albonubes
Temp14–22°C
pH6–8
Size4 cm
DietOmnivore
Swim—
DifficultyEasy
Adult tank30 L
Recommended group—
White cloud mountain minnow
Tanichthys albonubes
Nano-safe
Asia
Neon Blue Rasbora
Sundadanio axelrodi
Temp23–26°C
pH4–6.5
Size2.5 cm
DietOmnivore
Swim—
DifficultyHard
Adult tank30 L
Recommended group—
Neon Blue Rasbora
Sundadanio axelrodi
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.