Asia
Malabar pufferfish
Carinotetraodon travancoricus
Temp22–28°C
pH6.8–8
Size2.5 cm
DietCarnivore
Swim—
DifficultyExpert
Malabar pufferfish
Carinotetraodon travancoricus
Starting Small? Find the perfect fish for your nano tank.
Showing fish with recommended minimum tank size up to 5 gallon.
Nano-safe
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.
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
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
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.