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FishbeginnerFreshwater

Paradise Fish

Macropodus opercularis

AnimaliaChordataActinopterygiiOsphronemidae

📍 China, Korea, Vietnam & Southeast Asia

Ask Finn

One of the first tropical fish kept in aquariums, the paradise fish features bold red and blue vertical stripes and flowing fins. Hardy enough to tolerate cooler temperatures. Males are territorial but manageable in spacious, well-decorated tanks.

Size4"
Min Tank20g
aggressive
Zonetop

Care Guide

Diet

Paradise fish are omnivores that readily accept high-quality flake foods, pellets, and frozen foods like brine shrimp and bloodworms. Feed small amounts once daily, varying their diet with occasional vegetable matter such as blanched spinach or algae wafers. They will also consume small live foods and insects if available.

Behavior

Paradise fish are highly territorial and aggressive, especially males toward other males—they should be kept singly or in heavily planted tanks with visual barriers. They are active swimmers that prefer the upper water column and are known for their elaborate courtship displays and bubble-nesting behavior. They are hardy and can tolerate cooler temperatures than most tropical fish, making them resilient in varied conditions.

Breeding

Breeding in captivity is moderately difficult but achievable with proper conditioning and setup. Males build bubble nests and will aggressively guard eggs and fry; breeding pairs must be carefully monitored and separated after spawning to prevent the male from harming the female. Fry are small and require infusoria or liquid fry food initially before graduating to microworms and crushed flakes.

Common Diseases

Fin Rot

Symptoms

Frayed, discolored, or deteriorating fins; may appear white or black at edges

Treatment

Perform 25% water changes every 2-3 days, improve water quality, and treat with antibacterial medication if severe; ensure proper tank maintenance

Ich (Ichthyophthirius)

Symptoms

White spots on body and fins, rapid breathing, scratching against surfaces

Treatment

Raise temperature gradually to 28-30°C, treat with ich medication, and perform daily water changes; ensure good filtration and avoid stress

Velvet Disease

Symptoms

Fine golden or rust-colored dust on body, lethargy, clamped fins, rapid gill movement

Treatment

Treat with copper-based medication or formalin, increase aeration, and maintain water quality; quarantine affected fish if possible

Bacterial Infections

Symptoms

Open sores, red streaks on body, swollen areas, loss of appetite

Treatment

Improve water conditions with frequent changes, treat with broad-spectrum antibacterial medication, and isolate if spreading to tank mates

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Quick Facts

diet
Omnivore – pellets, flake, frozen bloodworms, live insects
lifespan
6–8 years
max size
10 cm (4 in)
tank size
20 gallons minimum
temperament
Semi-aggressive, territorial males

Water it likes

ph
6.0–8.0
ammonia
0 ppm
nitrate
<20 ppm
hardness
5–20 dGH
temperature
61–79°F (16–26°C)

Stats

Community tips0
Kept by0 hobbyists