Should I buy it?
Paradise fish
Macropodus opercularis
Also known as: paradise gourami
One of the first aquarium fish in the hobby. Hardy, colourful, and tolerant of cool water. Males are aggressive toward other labyrinth fish and long-finned species.
Paradise fish tank mates · 120L tank size hub
semi-aggressive · intermediate care
Sources & confidencehigh · partially verified · beginner: caution
Checked against several solid care sources that mostly agree. Numbers here are a careful starting point. Your tap water, tank size, and habits decide the rest. How we evaluate.
Best for: Species-only or robust mid-size community tanks 120L or more at 18–26 °C with a single male.
Avoid if: You keep bettas, gouramis, or long-finned guppies in the same setup.
Common mistakeKeeping a paradise fish with a betta is how keepers invent sustained labyrinth warfare regardless of tank size. Two surface fighters do not share. Plan one labyrinth centrepiece — or skip the mix. Stocking density will not fix a species clash at the film.
Top things that go wrong
- Fin-nipping risk in typical community layouts. Will nip long fins or slow fish when the school is too small, bored, or kept in a short tank.
- Mouth gap vs tiny tank mates. May eat tank mates small enough to fit the adult mouth — plan adult sizes, not shop sizes.
- Shrimp & snails. Not shrimp-safe — adults, fry, or both get eaten.
What most shops don't tell you
- 1.Myth: paradise fish and bettas can share a large community because both are pretty labyrinth fish. Reality: they fight at the surface for keeps — keep one labyrinth centrepiece only, not a mixed bubble-nest war in the same display tank.
- 2.Predation risk scales with gape, night feeding, and crowding. 'they grew up together' is a schedule, not a law.
- 3.Housed in unheated 30L bowls like a betta. Aggression and fin damage explode.
- 4.Kept with strictly tropical Amazon fish that need 27 to 30°C year round.
- 5.Breathes surface air but still needs clean oxygenated water. One male per standard community unless the tank is very long and broken up by structure.
About this species
Paradise fish are cool-temperate labyrinth gourami from China and Taiwan. Adults reach 8 cm and are strongly territorial in small or under-furnished tanks. Not a betta replacement in warm nano boxes. Plan a long tank with line-of-sight breaks and temperature in the 16 to 24°C range.
- Pearl Gourami100L min · same group, comparable tank size
- Opaline gourami150L min · same fish family
- Chocolate gourami80L min · same group, similar adult size
- Croaking gourami80L min · same group, similar adult size
- Dwarf Gourami60L min · same group, similar adult size
- Moonlight gourami180L min · same fish family
- Honey Gourami40L min · same group, similar adult size
- Sparkling Gourami40L min · same fish family
- Agassiz’s dwarf cichlidalso intermediate semi-aggressive, similar tank size
- American Flagfishalso intermediate semi-aggressive, similar tank size
- Angelfishalso intermediate semi-aggressive, similar tank size
- Apistogramma Borelliialso intermediate semi-aggressive, similar tank size
- Apistogramma Macmasterialso intermediate semi-aggressive, similar tank size
- Apistogramma Trifasciataalso intermediate semi-aggressive, similar tank size
No reverse lookups listed yet.
Plan grid
Key limits are above. Here: pH band, swim level, bioload, and activity.
Swim zones
Care snapshot
Quick compare before you buy. Not a score of how “good” the fish is.
- Beginner ease32
- Peacefulness8
- Community fit0
- Small-tank fit100
- Hardiness54
- Energy54
Numbers are deterministic planning indices from Fishori fields — not a scientific score of your individual fish.
Example setups
Starting points only. Run the pair checker for every fish you add.
Avoid “one of everything” baskets — Paradise fish belongs in a plan built around territory, line-of-sight breaks, and matched water chemistry.
Compatibility
Tank mates for Paradise fish
No unconditional “safe” tank mates are listed for Paradise fish — this shortlist has CAUTION pairings that need specific conditions and RISKY pairings to avoid. Conditional (CAUTION — read the pair page before buying): Boesemani Rainbowfish, Chili Rasbora, Corydoras Catfish, Dwarf Gourami, Gold / Chinese barb. Avoid (RISKY): Betta, German Blue Ram. Every name links to a live pair check — the lists are a shortlist, not a stocking plan.
Usually safer
Open a pair page with this fish as the starting point.
None listed. Use the pair checker before mixing.
Needs planning
Read the blocking rule on each pair page before experimenting.
Usually avoid
Do-not-stock combinations on conservative hobby rules.
No safe-mate list on this record yet. Use the fish index to find species with similar care, then run a pair check before you buy.
Behaviour and temperament
Paradise fish are semi-aggressive labyrinth fish that flare and fight at the surface, especially with other labyrinth species. They may tolerate robust midwater fish when space is honest. Stress and torn fins explode when a betta or second male shares the film.
What sets them off
- Small groups or boredom
- Long-finned or slow tank mates
- Bare tanks without structure
Fin nipping: Will nip long fins or slow fish when the school is too small, bored, or kept in a short tank.
Predation: May eat tank mates small enough to fit the adult mouth — plan adult sizes, not shop sizes.
Territory: Holds a patch (cave, corner, or surface). Break sight lines so neighbours can pass.
Planted tanks: good — easy plant ideas
In the glass: typical and warning signs
- A paradise holds mid-to-top water and breathes at an open surface.
- Flare displays toward reflections are normal ownership for males.
- Sustained fighting with a betta means species mix failed immediately.
- Clamped fins under a sealed stale lid mean air access failed first.
- Males fight other labyrinth fish and may harass long-finned neighbours.
- Crowded short tanks make surface contests nastier than the label suggests.
- Remove the betta or second labyrinth the same day fighting starts.
- Improve surface gas exchange before stacking more livestock upstairs.
Fish behaviour can vary between individuals and tank setups. Always observe new fish closely after introduction.
Water, food, and grouping
Hardness
medium
Diet
carnivore
Paradise fish are carnivore-leaning labyrinth fish that take frozen foods, quality pellets, and meaty items at mid-to-top water. Flake that sinks past them while a betta contest rages leaves them thin and furious. Feed deliberately under open air access, keep surface calm, and never treat them as decorative betta substitutes in the same glass.
Shrimp & snails
Not shrimp-safe — adults, fry, or both get eaten.
Paradise fish is fine singly or as a researched pair — check behaviour before doubling up.
- Hold 16 to 24 °C steadily on a real thermometer, not the dial on the heater.
- Aim for pH 6 to 7.5 and a hardness you can re-test in two weeks. A one-time strip in the shop car park is not a water test.
- Footprint: short wide tanks and tall narrow tanks fish differently for the same volume. Match the tank shape to the swim pattern, not just the litre count.
- Tank volume meets or exceeds 120L published minimum for adults.
- Heater can hold 16–24°C without cooking cooler-water tank mates.
- No known fin-nippers paired with long-finned fish unless you accept documented risk.
- No tank mates small enough to fit the adult mouth gap for this species.
Explore and stocking hubs
Tank-mates hub, matching guides, category peers, and litre stocking lists around this species’ minimum tank.
Plan with tools
Check mates as pairs first, then add this fish in the tank builder for the full stocking.
Filtration & heating
A 120L minimum tank needs a filter rated for at least 480L/hr turnover and a heater to hold 16–24°C reliably.
Plant suggestions
Paradise fish does well in planted tanks. Plants compatible with 16–24°C and pH 6–7.5:
Research: partially verified · Confidence: high · 4 linked source(s). We do not invent citations.
How Fishori evaluates compatibility (same logic as pair and tank tools).
- Seriously Fish. Macropodus opercularis
Primary: aquarium size, water chemistry, behaviour, and compatibility (URL verified in upgrade script; recheck if site content changes).
- FishBase. Macropodus opercularis
Secondary: taxonomy, distribution, and maximum length in nature; cross-check with aquarium import lines and measured tank parameters.
- Wikipedia. Macropodus opercularis
Secondary: general species context; verify all husbandry numbers against a dedicated aquarium care sheet and your test kit, not a single table row.
- Wikipedia. Paradise fish
Encyclopaedia-level overview; verify all aquarium care numbers on specialist care sheets for your stock.
Evidence notes
- The Seriously Fish profile for the binomial in this record was successfully reached as the primary aquarium reference.
- FishBase contributes natural-range size and habitat context. Translate those numbers through your heater, your water report, and your tank footprint before stocking.
- Wikipedia is only cited if the article URL returned OK. Use it for orientation, not as the only care sheet for an import.
- All compatibility text reflects typical hobby experience and the Fishori model. Individual fish, shop stress, and the order tank mates are added in can still defy a single-paragraph label.
Featured compatibility checks
Curated pair pages for Paradise fish. Each opens a full verdict — not just a list label.
Common questions about Paradise fish
- How big do Paradise fish get?
- Paradise fish adults reach about 8 cm. Shop fish look smaller; stock for the adult length.
- What size tank does Paradise fish need?
- 120L is the planning floor for adult swimming space and bioload. A 146L+ tank is the more comfortable long-term footprint. Length and depth matter as much as raw litres for active or territorial fish.
- Are Paradise fish aggressive?
- Paradise fish are semi-aggressive labyrinth fish that flare and fight at the surface, especially with other labyrinth species. They may tolerate robust midwater fish when space is honest. Stress and torn fins explode when a betta or second male shares the film.
- What is the most common mistake with Paradise fish?
- Keeping a paradise fish with a betta is how keepers invent sustained labyrinth warfare regardless of tank size. Two surface fighters do not share. Plan one labyrinth centrepiece — or skip the mix. Stocking density will not fix a species clash at the film.
- What fish can live with Paradise fish?
- This profile currently has no curated unconditional safe-mates shortlist for Paradise fish. Other species may still return GOOD in the pair checker, so check the exact pair rather than treating this shortlist as exhaustive. Boesemani Rainbowfish, Chili Rasbora, Corydoras Catfish, Dwarf Gourami are conditional (CAUTION): workable only with the specific conditions on each pair page. Avoid Betta, German Blue Ram (RISKY). Run the pair checker for your exact water and tank size before stocking.