🐟 AquaticCare difficulty: IntermediateLegal complexity: Low

Paradise fish

Macropodus opercularis · also called Paradise gourami, Blue paradise fish, Paradisefish

A strikingly colourful, hardy anabantid with red-and-blue barred flanks and flowing fins, one of the first tropical fish ever kept in the aquarium hobby. Tolerant of cooler water than most gouramis, but males are notably aggressive, so it suits a species or carefully chosen community tank.

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Quick facts

Size	2.5-4 in (6-10 cm)
Lifespan	6–8 years
Social needs	solo
Native region	East Asia
Origin	Old World
Climate	⛅ Subtropical
Water type	💧 Freshwater
Family	Osphronemidae
Genus	Macropodus

Part of the Gouramis

Gouramis are labyrinth-breathing freshwater fish from Asia that gulp air at the surface, build bubble nests, and range from tiny croaking species to large centerpiece fish. Many are peaceful and characterful, thriving in warm, calm, planted aquariums.

Chocolate gourami Croaking gourami Dwarf gourami Honey gourami Kissing gourami Licorice gourami Pearl gourami Sparkling gourami Three-spot gourami

Habitat & space requirements

From the minimum an animal needs to be kept humanely, up to the ideal setup. Bigger is almost always better — minimums are floors, not targets.

Photo coming soon

Minimum

Cool labyrinth tank

20 gal long / 75 L

Macropodus opercularis is a cool-water (16–24 °C) labyrinth fish — no heater needed in most homes. Males are aggressive; one male only, or a single fish. Tight lid (they jump).

Recommended

Planted species tank

29–40 gal / 110–150 L

Densely planted with floating cover, gentle flow, and a single male or carefully sexed group. Spectacular finnage and colour displays when given space.

Daniella Vereeken / CC BY 2.0 (Wikimedia Commons)

Photo coming soon

Ideal

Unheated planted biotope

55 gal+ / 200 L+ planted

Long unheated planted biotope with surface cover and territory anchors. Best colour, most natural bubble-nesting and display behaviour.

Life & growth stages

How this animal changes through its life — each stage often has its own care, diet and space needs.

Photo coming soon

Egg

Fish eggs are small, translucent spheres, often laid in clutches on plants, substrate, or in a nest — or carried/brooded by a parent in livebearing and mouth-brooding species. A dark eye spot and the curled embryo become visible inside as development progresses.

Photo coming soon

Fry

Newly hatched fry are tiny and semi-transparent, frequently still carrying a yolk sac that fuels them before they feed freely. They lack full fin structure and adult coloration, staying near cover until they can swim and forage on their own.

Photo coming soon

Juvenile

Juveniles look like miniature adults but with developing fins and muted or different markings; many species shift pattern and color as they mature. Growth is rapid at this stage given clean water and steady feeding.

Adult

Adults show the species' full size, finnage, and mature coloration, and are sexually mature. Many fish develop sex-specific differences in size, color, or fin shape, which can intensify during breeding.

Color & pattern variants

Natural variants occur in the wild; selectively bred (man-made) variants were developed in captivity.

Natural

representative

Wild-type paradise fish →

The classic red-and-blue barred form with the natural colouration.

representative

Wild-type (blue paradise) →

CommonBeginner

The classic form: alternating vertical red-orange and iridescent blue bars across the body with long flowing fins — one of the oldest fish in the hobby.

Tip: A labyrinth fish that breathes air and tolerates cool water, but males are very aggressive to each other — keep only one male per tank.

Selectively bred (man-made)

representative

Albino paradise fish →

A pale, red-eyed line-bred colour morph lacking dark pigment.

Blue paradise fish →

A selectively bred form with intensified blue body colour.

representative

Albino →

UncommonBeginner

An amelanistic strain in pale orange-and-white with red eyes, the blue bars reduced to soft pearly bands.

Tip: As hardy and cold-tolerant as the wild form; offer cover for the red eyes and still house only one male, as aggression is unchanged.

representative

Black / Concolor-look dark form →

UncommonIntermediate

A melanistic line bred for a near-uniform dark blue-black body that masks the red barring, prized for its smoky, dramatic look.

Tip: Care is the same as the standard paradise fish; the dark strain can be more sensitive to poor water, so keep parameters stable.

Habitat & enclosure

Provide at least a 20 gallon (75 L) long tank for one adult, more for a community. They are subtropical-tolerant, thriving at 60-79 F (16-26 C), so a heater is optional in a stable warm room. Keep pH 6.0-8.0 and soft to hard water; they are very adaptable. Use low flow and floating plants for cover, mirroring their slow rice-paddy and ditch habitat.

Substrate

Dark sand or fine gravel intensifies their colours in a planted layout. Dense planting and floating cover break sightlines and give weaker fish refuge from aggression.

Equipment & setup

A gentle sponge or low-flow filter keeps the water calm, and a heater is only needed in cool rooms given their subtropical tolerance. Fit a tight lid, since they are accomplished jumpers and breathe air at the surface.

Diet

Carnivorous-leaning omnivore that relishes live and frozen bloodworms, brine shrimp, daphnia and insect larvae, alongside quality pellets and flakes. A varied meaty diet brings out their best colour.

Behavior & temperament

Bold and often aggressive, especially mature males toward each other and toward small or long-finned fish, which they may attack or eat. Keep one male, or pair with fast, similarly assertive tankmates; avoid shrimp and tiny fish. Freshwater only, not a reef species.

Health

Very hardy but vulnerable to ich, fin rot and injuries from fighting; their wide temperature tolerance helps but rapid swings still stress them. Quarantine new fish and provide cover so subordinate individuals can escape dominant males.

Tips, DIY & hacks

Because of their aggression, the safest setup is a single male or a species tank. Males build bubble nests and court vigorously; provide floating plants and remove the female after spawning, as the male guards the nest and can harass her.

Sources

Paradise fish - Wikipedia (wikipedia)
Macropodus opercularis - Seriously Fish (care guide)
Wikipedia: Paradise fish (wiki)