Java Combtail (Belontia hasselti)

Family: Osphronemidae

Java Combtail — a Osphronemidae freshwater fish. Reaches 15–22 cm; keep at 25–30 °C.

Care parameters

Water temperature
25–30 °C
pH
6.5–8
GH hardness
5–19 dGH
Adult length
15–22 cm
Minimum tank
500 L
Water layer
Bottom-dwelling
Difficulty
Moderate
Temperament
Territorial; one male per tank

Species overview

Belontia hasselti of the family Osphronemidae is an aquarium-kept Osphronemidae. Territorial; one male per tank and carnivore; prepared foods plus frozen or live, it grows to 15–22 cm and prefers 25–30 °C water. Other Belontia species in our database include Belontia signata.

Native biotope

Habitat
Still waters, rice paddies and slow streams
Flow
Still to very gentle water
Dissolved O₂
Tolerates low oxygen; labyrinth breather

Aquascape & hardware

Substrate
Soft sand with leaf litter
Hardscape
Dense planting and shelters
Plants
Dense hardy plants reaching the surface

Temperament, diet & tankmates

Schooling
Solitary, pairs or small groups
Diet
Carnivore; prepared foods plus frozen or live
Recommended tankmates
  • Similar-sized peaceful community fish — Similar size and water needs
Avoid keeping with
  • Much smaller fish — May outcompete or bully tiny tankmates

Breeding & notes

Sexual dimorphism
Males larger with longer fins
Breeding method
Bubble-nest builder with paternal care

Frequently asked questions

Is Java Combtail easy to keep?

A moderate-level species: territorial; one male per tank; stable water matters more than fancy equipment.

What temperature and water chemistry does Java Combtail need?

Set the heater to 25–30 °C and avoid swings. pH 6.5–8, GH 5–19 dGH suit it.

How big does Java Combtail get, and what tank size?

Expect 15–22 cm as an adult, living bottom-dwelling. A 500 L tank or larger gives it room.

What does Java Combtail eat?

Carnivore; prepared foods plus frozen or live. Feed two small meals a day rather than one large one.

Can Java Combtail live with other fish?

Territorial; one male per tank; solitary, pairs or small groups. Good company: Similar-sized peaceful community fish — Similar size and water needs. Keep away from Much smaller fish — May outcompete or bully tiny tankmates.

Where does Java Combtail come from?

It lives in still waters, rice paddies and slow streams. Still to very gentle water; Tolerates low oxygen; labyrinth breather.

Does Java Combtail jump?

It can jump when startled — keep the tank tightly covered, especially at night and during maintenance.

How does Java Combtail breed?

Bubble-nest builder with paternal care. Males larger with longer fins.