Paradise Fish Care
Macropodus opercularis
The Paradise Fish is a striking East Asian labyrinth fish that tolerates cooler water but can become territorial. Good care requires swimming room, visual barriers and a considered male-to-female ratio. This guide covers aquarium setup, water, feeding, behaviour and breeding. Published ranges differ, so cautious overlapping guidance is used and uncertainty is explained. The fish breathes air at the surface, which must remain accessible. Do not automatically place this species in a warm community aquarium: its cooler temperature range and carefully chosen tankmates matter. Observe behaviour daily, especially after introductions and while a bubble nest is being built.
Plan your aquarium →At a glance
- Temperature
- 16–22 °C
- pH
- 6.0–8.0
- GH
- 5–12 °dGH
- Aquarium length
- At least 80 cm
- Minimum aquarium volume
- At least 100 L
- Adult size
- Up to 8 cm
- Group size
- At least 3 individuals
- Temperament
- Territorial
About this species
Macropodus opercularis, the Paradise Fish, belongs to Osphronemidae and can breathe atmospheric air with its labyrinth organ. It occurs in East Asia, including parts of China, Taiwan, Hainan and northern Vietnam. Males usually have longer, more elaborate fins. Several selectively bred colour forms exist; these do not remove the species’ territorial behaviour or space needs. Sources report a size of up to about 8 cm standard length.
Natural habitat
FishBase describes the species from varied lowland habitats, from structured river margins and small streams to irrigation channels and rice fields. Its labyrinth organ allows atmospheric breathing but does not replace normal aquarium filtration. A lid should not block access to air; at the same time, avoid a cold draft across the air space above the water.
Aquarium and layout
Seriously Fish and FishBase list a minimum aquarium length of 80 cm; Seriously Fish calculates about 72 litres for an 80 × 30 cm base at a 30 cm water depth. OATA recommends at least 100 litres for paradise fish and other larger gouramis in a small group. This guide therefore uses 100 litres as a cautious starting point for a harem setup, with a base at least 80 cm long. Extra space and visual barriers help divide territories. Use plants, wood or other safe structure, avoid strong flow and leave the surface accessible.
Water conditions
Seriously Fish recommends 10–22 °C for aquarium care; FishBase reports 16–26 °C as environmental data. This guide uses the overlap of 16–22 °C and describes the species as cool-water capable rather than tropical. The pH guidance is 6.0–8.0. Hardness ranges differ: Seriously Fish 5–20 dGH, FishBase 5–19 dH, and OATA’s general group guidance 4–12 dH. We use the cautious overlap of 5–12 dGH. OATA notes that general values do not replace species-specific checks. Keep water stable and avoid abrupt transitions.
Behaviour and group size
Males are territorial and may fight seriously, especially during breeding. Seriously Fish describes a harem arrangement with one male and several females; OATA gives at least three fish with two females per male as general group guidance to reduce stress. The aquarium must provide enough territory. Paradise fish may attack or eat small fish and are not automatically safe community fish. Choose tankmates only after considering adult size, fin shape, activity and shelter. Keep the surface accessible for air breathing.
Feeding
OATA classifies paradise fish as omnivores and recommends quality complete dry food, supplemented by small live or frozen prey. Seriously Fish mentions insect larvae, Daphnia, Artemia and worms. Vary the diet and match food size to the fish’s mouth. Feed small portions that are eaten promptly; overfeeding pollutes the water. Remove leftovers.
Breeding
The male builds a surface bubble nest, collects the eggs into it and guards the nest. Breeding requires a separate, quiet setup with floating plants and gentle flow. Territorial behaviour increases at this time; separate the female if she is repeatedly chased or injured. Fry need very fine first foods and stable rearing conditions. Egg counts and development times vary.
Sources & review
This care guide draws on several specialist sources and was last checked on .