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

Showing fish with recommended minimum tank size up to 5 gallon.

Nano-safe
Asia
Asian Stone Catfish

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

Schooling
Varies
Aggression
—
Compare
Nano-safe
Asia
Malabar pufferfish

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

Lifespan estimate
5 yr
Schooling
Varies
Aggression
—
Compare

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.