Species description

Care, breeding and tankmates

Fish profile

Temperament

Territorial

They exhibit a highly territorial and aggressive temperament, much like their Betta relatives. Males will flare their gills and fins dramatically to display dominance or intimidate rivals. While they can be kept in a community tank, their tank mates must be carefully selected to avoid conflicts. They are bold, inquisitive, and will quickly learn to recognize their owner during feeding time.

Diet

Omnivore

This species is an omnivorous micro-predator that eagerly accepts a wide variety of foods in captivity. Their diet should consist of high-quality flakes or pellets supplemented with live or frozen foods. Bloodworms, brine shrimp, and daphnia are excellent choices to enhance their vibrant coloration. They will also graze on small insects at the water surface.

Sex ratio

Harem

It is strongly recommended to keep a single male per aquarium due to their highly combative nature. A male can be kept with several females provided the tank is spacious and densely planted. Females will need plenty of hiding spots to escape the male's relentless pursuit during courtship. In smaller setups, keeping them individually is often the safest approach.

Feeding frequency

Twice daily

Feeding them once or twice a day with an amount they can consume within a few minutes is ideal. Overfeeding can lead to water quality issues and obesity in these enthusiastic eaters. It is beneficial to offer a fast day once a week to help clear their digestive system. A varied feeding schedule ensures they receive all necessary nutrients.

Bioload

The Paradise Fish produces a moderate bioload that is easily managed by standard filtration. Regular maintenance and partial water changes are essential to keep parameters stable. They are relatively hardy but will not tolerate poor water conditions for extended periods. A properly cycled aquarium is necessary to process their waste efficiently.

Flow

Strong

They prefer areas of slow-moving or stagnant water, reflecting their natural habitat in rice paddies and ditches. Strong currents from heavy filtration can stress them and impede their ability to build bubble nests. Baffling the filter output or using sponge filters creates the ideal gentle flow environment. Dense vegetation can also help break up unwanted water movement.

Jump risk

Yes

They are known to be excellent jumpers, particularly when hunting insects near the surface. A secure and tight-fitting aquarium lid is mandatory to prevent them from leaping to their demise. They can surprisingly jump through very small gaps around filters and heaters. Keeping the water level slightly lower can provide an extra margin of safety.

Reproduction

Bubble nest builder

They are prolific bubble nesters, with the male constructing a nest of mucous-coated bubbles at the surface. During spawning, the male wraps around the female, and eggs are released and placed into the nest. The male intensely guards the nest and fry, often becoming extremely aggressive towards any intruders. Once the fry become free-swimming, the male should be removed to prevent cannibalism.

Compatibility & tankmates

Community

They can be quite aggressive and territorial, especially males towards each other or similar-looking fish. They are best kept with robust, fast-moving schooling fish that dwell in the mid to lower levels. Avoid keeping them with slow-moving or long-finned species which may become targets for fin-nipping. Careful observation is required when introducing new tank mates.

Tank level

Top/Middle

They are primarily top-dwelling fish, spending the majority of their time near the water surface. As labyrinth fish, they must frequently gulp atmospheric air to supplement their oxygen intake. Floating plants are highly appreciated and provide cover that makes them feel secure. They will occasionally venture into the mid-levels to forage or patrol their territory.