A labyrinth fish native to Chinese paddies and ditches, breathing air and flashing bold blue-and-red bars.
Care parameters
Water temperature
16–26 °C
pH
6–8
GH hardness
5–30 dGH
Adult length
6–7 cm
Minimum tank
40 L
Water layer
All layers; surface air-breather
Difficulty
Easy
Temperament
Territorial; males are aggressive to rivals
Origin
Southern China — Pearl & Yangtze basins
Species overview
One of the first tropical ornamentals ever kept, the Chinese paradise fish is a native labyrinth fish of southern China's rice paddies, marshes and slow ditches. Its accessory breathing organ lets it survive warm, stagnant, low-oxygen water where few other fish persist. Hardy and cold-tolerant, it is strikingly colored but territorial — a characterful centerpiece for a quiet, well-covered tank.
Native biotope
Habitat
Rice paddies, ditches and sluggish streams
Flow
Still to slow
Dissolved O₂
Low-oxygen tolerant via labyrinth organ
Aquascape & hardware
Substrate
Dark sand to deepen coloration
Hardscape
Driftwood and leaf litter for cover and tannins
Plants
Dense and floating plants providing surface cover
Temperament, diet & tankmates
Schooling
Solitary or a single pair — one male per tank
Diet
Carnivore; live and frozen foods, quality flakes
Recommended tankmates
Fast mid-water deter fish — Stay out of its territory
Larger peaceful barbs — Too big to be bullied
Nerite snails — Ignored, safe algae crew
Avoid keeping with
Other male paradise fish — Fatal fighting
Betta splendens — Mutual aggression
Dwarf shrimp — Hunted and eaten
Long-finned fish — Fins get nipped
Breeding & notes
Sexual dimorphism
Males are larger with longer, pointed, more colorful fins; females are duller and rounder
Breeding method
Bubble-nest builder. The male constructs a surface nest, embraces the female beneath it, then tends the eggs and fry alone — remove the female after spawning to prevent aggression.
Frequently asked questions
Can paradise fish live without a filter?
They can tolerate it, but a gentle filter is still better for long-term health. Their real requirement is access to the air surface and regular water changes.
Can I keep two males together?
Only in a large, heavily planted tank where each can claim a territory. In small tanks one male per tank is the safe rule.
Are they related to bettas?
Yes — both are labyrinth fishes of the family Osphronemidae, and paradise fish were the bettas of the eighteenth century. They share the air-breathing organ and bubble-nest breeding.
Why is my fish gulping at the surface?
Normal behavior — labyrinth fish breathe atmospheric air routinely. Only worry if gulping becomes constant and labored, which signals poor water or low oxygen.
Can paradise fish live with bettas?
Not recommended: both are territorial labyrinth fishes and will fight, with the larger paradise fish usually injuring the betta.