Photo: Gouramii (CC0) — via Wikimedia Commons
Samurai Gourami (Sphaerichthys vaillanti)
A rare Bornean gem with rich chocolate-and-cream banding — strikingly beautiful but demanding soft, blackwater conditions and expert care.
Will it live with a Samurai Gourami?
We compare each fish against your samurai gourami on temperament, size, water parameters and swimming zone. Set your tank size and filter the results.
- Adolf's Cory✅ CompatiblePeaceful · 5.5 cm · Medium care · 22–26 °C (72–79 °F)
- Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Keep Adolf's Cory in a shoal of 6+ or it gets stressed and nippy.
- Agassiz's Corydoras✅ CompatiblePeaceful · 6 cm · Easy care · 22–28 °C (72–82 °F)
- Compatible on the things that matter: shared water near 24–28 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Agassiz's Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Blackline Rasbora✅ CompatiblePeaceful · 6 cm · Easy care · 22–28 °C (72–82 °F)
- Compatible on the things that matter: shared water near 24–28 °C, workable temperaments, and no predator-and-prey size gap.
- Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
- Keep Blackline Rasbora in a shoal of 6+ or it gets stressed and nippy.
- Blood Red Tiger Pleco✅ CompatiblePeaceful · 6 cm · Medium care · 24–29 °C (75–84 °F)
- Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Bloodfin Tetra✅ CompatiblePeaceful · 5.5 cm · Easy care · 18–28 °C (64–82 °F)
- Compatible on the things that matter: shared water near 24–28 °C, workable temperaments, and no predator-and-prey size gap.
- Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
- Keep Bloodfin Tetra in a shoal of 6+ or it gets stressed and nippy.
- Butterfly Hillstream Loach✅ CompatiblePeaceful · 6 cm · Hard care · 18–24 °C (64–75 °F)
- Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Corydoras Catfish✅ CompatiblePeaceful · 6.5 cm · Easy care · 22–26 °C (72–79 °F)
- Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Keep Corydoras Catfish in a shoal of 6+ or it gets stressed and nippy.
- Costa's Tetra✅ CompatiblePeaceful · 7 cm · Easy care · 22–28 °C (72–82 °F)
- Both are peaceful, and their water overlaps around 24–28 °C — no size, zone or temperament conflicts.
- Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
- Keep Costa's Tetra in a shoal of 6+ or it gets stressed and nippy.
- Croaking Gourami✅ CompatiblePeaceful · 7 cm · Easy care · 24–28 °C (75–82 °F)
- Compatible on the things that matter: shared water near 24–28 °C, workable temperaments, and no predator-and-prey size gap.
- Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
- Diamond Tetra✅ CompatiblePeaceful · 6 cm · Easy care · 22–28 °C (72–82 °F)
- Both are peaceful, and their water overlaps around 24–28 °C — no size, zone or temperament conflicts.
- Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
- Keep Diamond Tetra in a shoal of 6+ or it gets stressed and nippy.
- Duplicareus Corydoras✅ CompatiblePeaceful · 5.5 cm · Medium care · 23–27 °C (73–81 °F)
- Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Keep Duplicareus Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Elegant Cory✅ CompatiblePeaceful · 6 cm · Easy care · 22–28 °C (72–82 °F)
- Compatible on the things that matter: shared water near 24–28 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Elegant Cory in a shoal of 6+ or it gets stressed and nippy.
- False Julii Corydoras✅ CompatiblePeaceful · 6 cm · Easy care · 22–26 °C (72–79 °F)
- Both are peaceful, and their water overlaps around 24–26 °C — no size, zone or temperament conflicts.
- Keep False Julii Corydoras in a shoal of 6+ or it gets stressed and nippy.
- German Blue Ram✅ CompatiblePeaceful · 6 cm · Hard care · 27–30 °C (81–86 °F)
- Both are peaceful, and their water overlaps around 27–28 °C — no size, zone or temperament conflicts.
- Glass Bloodfin Tetra✅ CompatiblePeaceful · 6 cm · Easy care · 22–28 °C (72–82 °F)
- Compatible on the things that matter: shared water near 24–28 °C, workable temperaments, and no predator-and-prey size gap.
- Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
- Keep Glass Bloodfin Tetra in a shoal of 6+ or it gets stressed and nippy.
- Hillstream Loach✅ CompatiblePeaceful · 6 cm · Hard care · 20–24 °C (68–75 °F)
- Both are peaceful, and their water overlaps around 24–24 °C — no size, zone or temperament conflicts.
- Narcissus II Cory✅ CompatiblePeaceful · 5.5 cm · Medium care · 22–26 °C (72–79 °F)
- Both are peaceful, and their water overlaps around 24–26 °C — no size, zone or temperament conflicts.
- Keep Narcissus II Cory in a shoal of 6+ or it gets stressed and nippy.
- Neon Dwarf Rainbowfish✅ CompatiblePeaceful · 6 cm · Easy care · 23–27 °C (73–81 °F)
- Both are peaceful, and their water overlaps around 24–27 °C — no size, zone or temperament conflicts.
- Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
- Keep Neon Dwarf Rainbowfish in a shoal of 6+ or it gets stressed and nippy.
- Peacock Gudgeon✅ CompatiblePeaceful · 7 cm · Medium care · 22–28 °C (72–82 °F)
- Both are peaceful, and their water overlaps around 24–28 °C — no size, zone or temperament conflicts.
- Both favour the middle of the tank — offer enough cover so they aren't always in each other's space.
- Pearl Danio✅ CompatiblePeaceful · 6 cm · Easy care · 20–25 °C (68–77 °F)
- Compatible on the things that matter: shared water near 24–25 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Rust Corydoras✅ CompatiblePeaceful · 5.5 cm · Easy care · 23–27 °C (73–81 °F)
- Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Keep Rust Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Slate Corydoras✅ CompatiblePeaceful · 6 cm · Medium care · 23–28 °C (73–82 °F)
- Compatible on the things that matter: shared water near 24–28 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Slate Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Spotfin Corydoras✅ CompatiblePeaceful · 6.5 cm · Easy care · 22–26 °C (72–79 °F)
- Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Keep Spotfin Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Sterbai Corydoras✅ CompatiblePeaceful · 6.5 cm · Medium care · 24–30 °C (75–86 °F)
- Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Keep Sterbai Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Ash Lipped Apisto⚠️ With cautionSemi-aggressive · 7 cm · Hard care · 24–29 °C (75–84 °F)
- Ash Lipped Apisto and Samurai Gourami are close in size, but the semi-aggressive one tends to dominate — add samurai gourami in a group to spread the pressure.
- Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
- Banded Dwarf Cichlid⚠️ With cautionSemi-aggressive · 7 cm · Medium care · 24–30 °C (75–86 °F)
- Banded Dwarf Cichlid is semi-aggressive and may chase or nip the smaller Samurai Gourami — plant heavily and break up sight lines.
- Betta⚠️ With cautionSemi-aggressive · 6.5 cm · Easy care · 24–28 °C (75–82 °F)
- Expect Betta to harass Samurai Gourami at times; give dense cover and watch them at feeding.
- Samurai Gourami and Betta are both labyrinth fish and often treat each other as rivals — give a large, broken-up tank and be ready to separate them.
- Black Ruby Barb⚠️ With cautionSemi-aggressive · 6 cm · Easy care · 22–26 °C (72–79 °F)
- Black Ruby Barb is semi-aggressive and may chase or nip the smaller Samurai Gourami — plant heavily and break up sight lines.
- Your 75 L tank is below the ~100 L this pairing really wants — crowding raises aggression.
- Keep Black Ruby Barb in a shoal of 6+ or it gets stressed and nippy.
- Black Skirt Tetra⚠️ With cautionSemi-aggressive · 6 cm · Easy care · 20–26 °C (68–79 °F)
- Black Skirt Tetra is semi-aggressive and may chase or nip the smaller Samurai Gourami — plant heavily and break up sight lines.
- Keep Black Skirt Tetra in a shoal of 6+ or it gets stressed and nippy.
- Colombian Tetra⚠️ With cautionSemi-aggressive · 6.5 cm · Easy care · 24–28 °C (75–82 °F)
- Colombian Tetra and Samurai Gourami are close in size, but the semi-aggressive one tends to dominate — add samurai gourami in a group to spread the pressure.
- Your 75 L tank is below the ~114 L this pairing really wants — crowding raises aggression.
- Keep Colombian Tetra in a shoal of 6+ or it gets stressed and nippy.
- Desert Goby⚠️ With cautionSemi-aggressive · 6 cm · Easy care · 18–28 °C (64–82 °F)
- Different pH ranges (4–6.5 vs 7–8.5); doable if you sit in the shared band, but not ideal long-term.
- Water hardness preferences differ (Samurai Gourami 0–5 vs Desert Goby 8–20 dGH).
- Expect Desert Goby to harass Samurai Gourami at times; give dense cover and watch them at feeding.
- Dwarf Chain Loach⚠️ With cautionPeaceful · 6 cm · Medium care · 24–29 °C (75–84 °F)
- Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
- Keep Dwarf Chain Loach in a shoal of 6+ or it gets stressed and nippy.
- Eastern Betta⚠️ With cautionSemi-aggressive · 6 cm · Medium care · 24–28 °C (75–82 °F)
- Eastern Betta and Samurai Gourami are close in size, but the semi-aggressive one tends to dominate — add samurai gourami in a group to spread the pressure.
- Samurai Gourami and Eastern Betta are both labyrinth fish and often treat each other as rivals — give a large, broken-up tank and be ready to separate them.
- GloFish Tetra⚠️ With cautionSemi-aggressive · 6 cm · Easy care · 21–28 °C (70–82 °F)
- Expect GloFish Tetra to harass Samurai Gourami at times; give dense cover and watch them at feeding.
- Keep GloFish Tetra in a shoal of 6+ or it gets stressed and nippy.
- Guppy⚠️ With cautionPeaceful · 6 cm · Easy care · 22–28 °C (72–82 °F)
- Different pH ranges (4–6.5 vs 6.8–7.8); doable if you sit in the shared band, but not ideal long-term.
- Water hardness preferences differ (Samurai Gourami 0–5 vs Guppy 8–12 dGH).
- Odessa Barb⚠️ With cautionSemi-aggressive · 6 cm · Easy care · 20–26 °C (68–79 °F)
- Expect Odessa Barb to harass Samurai Gourami at times; give dense cover and watch them at feeding.
- Keep Odessa Barb in a shoal of 6+ or it gets stressed and nippy.
- Peaceful Betta⚠️ With cautionSemi-aggressive · 6 cm · Medium care · 24–28 °C (75–82 °F)
- Expect Peaceful Betta to harass Samurai Gourami at times; give dense cover and watch them at feeding.
- Samurai Gourami and Peaceful Betta are both labyrinth fish and often treat each other as rivals — give a large, broken-up tank and be ready to separate them.
- Platy⚠️ With cautionPeaceful · 6 cm · Easy care · 21–28 °C (70–82 °F)
- pH preferences only just meet (Samurai Gourami 4–6.5 vs Platy 7–8.2) — target the overlap and acclimate slowly.
- One likes softer water and the other harder (0–5 vs 10–28 dGH) — a compromise, not a perfect match.
- Smaragd Betta⚠️ With cautionAggressive · 6 cm · Medium care · 23–28 °C (73–82 °F)
- Expect Smaragd Betta to harass Samurai Gourami at times; give dense cover and watch them at feeding.
- Samurai Gourami and Smaragd Betta are both labyrinth fish and often treat each other as rivals — give a large, broken-up tank and be ready to separate them.
- Three-striped Dwarf Cichlid⚠️ With cautionSemi-aggressive · 6 cm · Medium care · 23–29 °C (73–84 °F)
- Three-striped Dwarf Cichlid is semi-aggressive and may chase or nip the smaller Samurai Gourami — plant heavily and break up sight lines.
- Alligator Gar⛔ Not recommendedAggressive · 250 cm · Hard care · 24–28 °C (75–82 °F)
- Samurai Gourami is bite-sized to a 250 cm predatory alligator gar — it will be eaten.
- pH preferences only just meet (Samurai Gourami 4–6.5 vs Alligator Gar 6.8–7.8) — target the overlap and acclimate slowly.
- Alligator Gar is aggressive and may chase or nip the smaller Samurai Gourami — plant heavily and break up sight lines.
- Your 75 L tank is below the ~3785 L this pairing really wants — crowding raises aggression.
- Clown Knifefish⛔ Not recommendedAggressive · 90 cm · Hard care · 24–28 °C (75–82 °F)
- Size gap is too large (90 vs 6 cm): Clown Knifefish will treat Samurai Gourami as food.
- Clown Knifefish clearly outsizes Samurai Gourami and is aggressive; risky unless the tank is big and well-planted.
- Your 75 L tank is below the ~750 L this pairing really wants — crowding raises aggression.
- Fire Eel⛔ Not recommendedSemi-aggressive · 100 cm · Medium care · 24–28 °C (75–82 °F)
- Size gap is too large (100 vs 6 cm): Fire Eel will treat Samurai Gourami as food.
- Fire Eel clearly outsizes Samurai Gourami and is semi-aggressive; risky unless the tank is big and well-planted.
- Your 75 L tank is below the ~380 L this pairing really wants — crowding raises aggression.
- Koi⛔ Not recommendedPeaceful · 90 cm · Medium care · 4–28 °C (39–82 °F)
- Samurai Gourami is bite-sized to a 90 cm koi — it will be eaten.
- Water hardness preferences differ (Samurai Gourami 0–5 vs Koi 9–18 dGH).
- Your 75 L tank is below the ~3800 L this pairing really wants — crowding raises aggression.
- Redtail Catfish⛔ Not recommendedAggressive · 120 cm · Hard care · 24–27 °C (75–81 °F)
- Redtail Catfish (120 cm) is big enough to swallow the 6 cm Samurai Gourami whole.
- Redtail Catfish clearly outsizes Samurai Gourami and is aggressive; risky unless the tank is big and well-planted.
- Your 75 L tank is below the ~5700 L this pairing really wants — crowding raises aggression.
- Spotted Gar⛔ Not recommendedAggressive · 90 cm · Hard care · 18–26 °C (64–79 °F)
- Size gap is too large (90 vs 6 cm): Spotted Gar will treat Samurai Gourami as food.
- Expect Spotted Gar to harass Samurai Gourami at times; give dense cover and watch them at feeding.
- Your 75 L tank is below the ~600 L this pairing really wants — crowding raises aggression.
- Wels Catfish⛔ Not recommendedAggressive · 300 cm · Hard care · 15–25 °C (59–77 °F)
- Wels Catfish (300 cm) is big enough to swallow the 6 cm Samurai Gourami whole.
- Wels Catfish clearly outsizes Samurai Gourami and is aggressive; risky unless the tank is big and well-planted.
- Your 75 L tank is below the ~20000 L this pairing really wants — crowding raises aggression.
- Wolf Cichlid⛔ Not recommendedAggressive · 72 cm · Hard care · 24–30 °C (75–86 °F)
- Samurai Gourami is bite-sized to a 72 cm predatory wolf cichlid — it will be eaten.
- Different pH ranges (4–6.5 vs 7–8); doable if you sit in the shared band, but not ideal long-term.
- Water hardness preferences differ (Samurai Gourami 0–5 vs Wolf Cichlid 8–20 dGH).
- Wolf Cichlid is aggressive and may chase or nip the smaller Samurai Gourami — plant heavily and break up sight lines.
- Your 75 L tank is below the ~760 L this pairing really wants — crowding raises aggression.
Compatibility is computed from each species' care data — a strong starting point, not a guarantee. Individual temperament varies, so always introduce new fish slowly and watch them.
Samurai Gourami care specs
- Care level
- Hard
- Breeding
- Very Hard
- Max size
- 6 cm (2.4 in)
- Min tank size
- 60 L (15.9 gal)
- Temperature
- 24–28 °C (75–82 °F)
- pH
- 4–6.5
- Hardness
- 0–5 dGH
- Lifespan
- 3–5 years
- Diet
- Carnivore
- Swim level
- Middle
- Group size
- 4+ (shoaling)
- Family
- Osphronemidae
- Origin
- Borneo — Kapuas River basin, West Kalimantan (Indonesia) and Sarawak (Malaysia)
What is a Samurai Gourami?
The Samurai Gourami (Sphaerichthys vaillanti), also called Vaillant’s Chocolate Gourami or Vaillant’s Gourami, is a small labyrinth fish from the blackwater streams of Borneo. Adults reach about 6 cm (2.4 in) and wear a genuinely striking pattern: a dark chocolate-brown body crossed by bold cream-to-white horizontal bands that extend into the fins. Males intensify this banding at breeding time, giving the fish the armoured look that earns it the “Samurai” common name.
Like all labyrinth fish, the Samurai Gourami possesses a suprabranchial organ that allows it to breathe atmospheric air directly from the surface — a useful trait in the warm, oxygen-poor peat-stained waters of its homeland. What sets S. vaillanti apart from its close relative the Chocolate Gourami (S. osphromenoides) is its mouthbrooding strategy: it is a paternal mouthbrooder, meaning the male, not the female, incubates the eggs in his buccal cavity until the fry are free-swimming.
This is unambiguously a species for experienced fishkeepers. Its water chemistry demands are extreme and non-negotiable, it is sensitive to stress and water-quality fluctuations, and it rarely accepts dry foods. For the dedicated aquarist willing to meet those demands, however, the Samurai Gourami is one of the most visually distinctive and behaviorally interesting gouramis available.
Where does the Samurai Gourami come from?
The Samurai Gourami is native to Borneo — specifically the Kapuas River basin of West Kalimantan, Indonesia, and adjacent parts of Sarawak, Malaysia. Its natural habitat is heavily tannin-stained blackwater: slow-moving or still forest streams, peat swamp channels and flooded forest margins where fallen leaves accumulate and decompose over soft, dark substrate.
The water in these environments is remarkably extreme by aquarium standards — pH values below 4.0 are common, hardness is essentially zero, and the tea-coloured water filters out most visible light while keeping temperatures warm and stable year-round. Dissolved organic compounds from decaying vegetation act as natural antimicrobials, keeping pathogen loads low and helping the fish’s immune defenses work in partnership with its environment.
Understanding this origin is essential to keeping the species alive. Attempts to maintain it in moderately hard, near-neutral “community water” rarely succeed long-term.
What tank setup and size does the Samurai Gourami need?
A group of four Samurai Gouramis — the recommended minimum group size — needs at least 60 litres (16 gallons). A longer footprint (60–80 cm / 24–32 in) is preferable to a tall one, since these fish are middle-water dwellers and use horizontal swimming space more than vertical height.
The tank should be set up as a blackwater biotope:
- Substrate: Fine dark sand or bare bottom; no calcareous gravel or coral sand that would raise hardness.
- Botanicals: Indian almond (Catappa) leaves, alder cones, coco pods and similar items release tannins and humic acids that acidify the water and recreate the natural water chemistry.
- Plants: Low-light plants that tolerate very soft, acidic water — Java fern, Cryptocoryne species, Bucephalandra and floating plants like frogbit or Amazon frogbit for surface cover.
- Lighting: Dim. Bright light stresses this species; use a low-output fixture or shade the tank with dense floating cover.
- Filtration: Gentle flow only. A sponge filter or a canister running at low turnover is ideal — strong currents are foreign to their natural habitat and increase stress. Peat filtration or peat in the filter media helps maintain soft, acidic conditions.
- Lid: Essential; labyrinth fish jump.
What water parameters does the Samurai Gourami need?
These are non-negotiable parameters — the species does not adapt to “normal” community water:
- Temperature: 24–28 °C (75–82 °F)
- pH: 4.0–6.5
- Hardness: 0–5 dGH (effectively zero carbonate hardness)
- Nitrates: Keep as low as possible, ideally below 10 ppm; this species is unusually intolerant of nitrate accumulation.
Achieving this requires using reverse osmosis (RO) water or very soft rainwater as the base, then lowering pH through peat filtration and botanical additions rather than chemical additives. Tap water — even moderately soft tap water — typically contains enough carbonates to buffer pH out of the acceptable range and will slowly harm the fish.
Stability is as important as the numbers themselves. Sudden shifts in pH or temperature trigger immune suppression and disease outbreaks. Change water in small increments (10–15% at a time, matched to tank temperature and chemistry) rather than large weekly changes.
What do Samurai Gouramis eat?
The Samurai Gourami is a carnivore that feeds on small invertebrates in the wild. In captivity it almost always refuses dry flake or pellet foods, at least initially, making a reliable supply of live or frozen invertebrate-based foods essential:
- Live foods: Daphnia, micro-worms, baby brine shrimp (artemia nauplii), white worms, grindal worms, mosquito larvae.
- Frozen foods: Bloodworms, daphnia, cyclops, artemia — the widest variety you can maintain.
Feed small amounts once or twice a day. Overfeeding in a low-flow blackwater tank degrades water quality rapidly. Some individuals can be slowly conditioned to accept high-quality micro-pellets or freeze-dried foods over time, but this should be considered a supplement rather than a staple. Never rely on dry foods as the sole diet.
How does the Samurai Gourami behave — and what fish can live with it?
The Samurai Gourami is peaceful and notably timid. Intraspecific aggression is minimal provided the group is kept at four or more individuals; conspecific males may display to each other but rarely cause injury. The species is easily spooked by rapid movements, bright lighting or boisterous neighbours.
Because of its extreme water chemistry requirements, potential tank-mates are limited to species that can thrive in acidic, very soft blackwater. Good candidates include other Bornean blackwater species — small Boraras microrasboras, Sundadanio species, small Pangio kuhli loaches, Otocinclus (in suitably soft conditions) or other Sphaerichthys gouramis — provided the tank is large enough to avoid competition.
Avoid: large or fast-moving fish, fin-nippers of any kind, any species requiring neutral-to-hard water, or any fish with a semi-aggressive or boisterous temperament. The Samurai Gourami’s combination of shy temperament and demanding chemistry makes it best kept as a species-focused blackwater community rather than a general community tank.
For a vetted list of compatible species, see Samurai Gourami tank mates.
How do you tell male and female Samurai Gouramis apart?
Sexual dimorphism in S. vaillanti is reasonably clear in healthy, well-conditioned adults:
Males have visibly pointed dorsal and anal fins and display stronger, more contrasting cream banding against the chocolate background — a difference that becomes especially pronounced during breeding condition. Their body profile is slimmer.
Females are rounder-bodied, particularly around the abdomen when gravid, and their dorsal and anal fins have a more rounded or blunt tip. Females tend to show less vivid banding than males, though this is not always a reliable indicator across all individuals.
In juveniles the difference is subtle; sex is generally not reliably determinable until fish reach around 3–4 cm. Acquiring a group of six or more juveniles and allowing them to pair naturally is the most practical approach.
How do Samurai Gouramis breed?
Breeding S. vaillanti is rated Very Hard and requires meticulous preparation. Unlike many gouramis, the Samurai Gourami is a paternal mouthbrooder: after spawning, the male takes the fertilised eggs into his mouth and holds them — and later the hatching larvae — for several weeks until the fry are capable of feeding independently.
To attempt breeding:
- Condition the pair with intensive live-food feeding for several weeks.
- Provide a species-only breeding tank (30–60 L, blackwater parameters, dimly lit, heavily planted, gentle sponge filtration only).
- Do not disturb a brooding male. He will likely fast during the brooding period; premature spitting of the brood is common if he is stressed by handling, water changes or tankmate aggression.
- Brood duration is typically several weeks; exact timing varies by temperature.
- Fry are tiny and require infusoria, commercial micro-fry foods or the smallest artemia nauplii as first foods. Water quality must remain pristine.
Success rates even among experienced breeders are modest. Documented breeding reports in specialist forums are the best source of current, granular guidance.
What diseases are common in Samurai Gouramis?
The Samurai Gourami is more disease-prone than most aquarium fish, primarily because suboptimal water chemistry suppresses its immune system. Common problems include:
- Velvet (Oodinium): A fine, gold-dust-like coating on the body and fins; spreads quickly in warm water.
- White spot / Ich: Less common in very acidic water but possible, particularly after stress or temperature drops.
- Bacterial infections: Fin rot and body ulcers, almost always triggered by water-quality lapses — elevated nitrates, incorrect pH or temperature fluctuation.
- Internal parasites: New imports are frequently carrying internal parasites; a quarantine period with appropriate treatment is strongly recommended before introduction to a display tank.
- Wasting / failure to feed: A significant risk with new specimens; fish that repeatedly refuse food in the first weeks rarely recover. Address water chemistry and food variety immediately.
Prevention centres entirely on maintaining correct blackwater parameters, keeping nitrates minimal, quarantining all new stock, and reducing every source of stress. Do not mix this species with boisterous tank-mates, do not use harsh filtration, and do not make large or abrupt water changes.
Health note: medication dosing and specific disease diagnosis are beyond the scope of this care profile. Always confirm symptoms against a reputable aquatic veterinary or fish-health source, and treat in a quarantine tank where possible to protect the biological filter.
How long does the Samurai Gourami live?
Under good conditions — faithful blackwater parameters, a varied live-food diet, a stable and low-stress environment — the Samurai Gourami lives approximately 3–5 years. Wild-caught specimens (which make up much of the trade supply) arrive as sub-adults or adults, so some of that lifespan may already have elapsed by the time of purchase.
Captive-bred fish, when available, tend to acclimate more readily to aquarium conditions and are the better choice where possible. The Samurai Gourami’s demanding nature means that lifespan is directly proportional to the care standard — fish kept in unsuitable chemistry rarely reach three years, while those in a well-maintained blackwater setup regularly do.
Frequently asked questions
Is the Samurai Gourami the same as the Chocolate Gourami?
No — both belong to the genus Sphaerichthys, but the Samurai Gourami (S. vaillanti) is a separate species from the more commonly kept Chocolate Gourami (S. osphromenoides). They share similar care requirements but differ in markings and in which sex mouthbroods the eggs; S. vaillanti is a paternal mouthbrooder (the male holds the eggs).
Why is the Samurai Gourami so difficult to keep?
It demands extremely soft, acidic blackwater conditions (pH 4.0–6.5, hardness under 5 dGH) and is intolerant of elevated nitrates or swings in water chemistry. It is also shy, prone to stress in bright or busy tanks, and requires live or frozen foods to feed reliably. Even experienced hobbyists find it challenging.
What you need to keep a samurai gourami
The baseline is a heated, filtered 60 L+ tank: a reliable heater to hold 24–28 °C (75–82 °F), a gentle filter that won't batter a samurai gourami in the current, and a tight-fitting lid. Cycle the tank fully before adding any fish.
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