Celebes Halfbeak
The (Nomorhamphus liemi) is a striking surface-dwelling freshwater fish native to the streams and rivers of Sulawesi, Indonesia. Easily recognised by its elongated lower jaw, this species brings constant activity and unique visual interest to the upper levels of the aquarium.
s are best kept in small groups and thrive in calm, well-maintained aquariums with floating plants and gentle water flow. While generally peaceful, males may show mild territorial behaviour, making a higher female-to-male ratio ideal. Their unusual appearance and engaging behaviour make them a standout choice for experienced community fish keepers.
Physical Characteristics:
Size: 6–8 cm
Body Shape: Slender body with elongated lower jaw
Colouration: Silver to olive body with subtle markings
Sexual Dimorphism:
Males are slimmer and possess a modified anal fin (andropodium)
Females are slightly larger and fuller-bodied
Lifespan: 3–5 years with proper care
Behaviour & Temperament:
Temperament: Peaceful to mildly territorial between males
Swimming Level: Surface dweller
Social Behaviour: Best kept in groups; higher female ratio recommended
Activity Level: Active, especially near the water surface
Aquarium Requirements:
Tank Size: Minimum 60 litres
Water Temperature: 24–28°C
pH Range: 7.0–8.0
Hardness: 8–20 dGH
Water Flow: Gentle to moderate
Tank Setup: Plenty of surface cover using floating plants
Lighting: Moderate
Feeding:
s are surface feeders and thrive on a varied diet:
High-quality floating flakes or micro pellets
Frozen foods such as daphnia, mosquito larvae, and brine shrimp
Occasional live foods encouraged for best health
Feed small amounts once or twice daily.
Compatibility:
Good Tank Mates:
Peaceful tetras
Rasboras
Corydoras
Small rainbowfish
Avoid:
Aggressive or fin-nipping species
Bottom feeders that disturb surface feeding
Large predatory fish
Special Considerations:
Sensitive to poor water quality
Secure aquarium lid recommended (can jump)
Floating plants help reduce stress
Males may spar if overcrowded