Three-spot (Blue/Opaline/Gold) Gourami Care Guide

The three-spot gourami is hardy, adaptable and genuinely easy to keep alive — which is exactly why its "peaceful community fish" reputation is so misleading. It grows to a hand-sized 15 cm, and males in particular turn territorial and often downright spiteful as they mature, nipping and harassing slower, long-finned tankmates. Buy it for its toughness, not for a guarantee of peace.

Three-spot (Blue/Opaline/Gold) Gourami at a glance

The sourced figures the welfare engine uses to judge Three-spot (Blue/Opaline/Gold) Gourami — the parseable key facts.

Where it comes from

Trichopodus trichopterus is a Southeast Asian generalist from the Mekong basin and beyond — southern China, Myanmar, Laos, Thailand, Cambodia, Vietnam, Malaysia and parts of Indonesia — and it is widely introduced elsewhere. Its home is "languid, heavily-vegetated lowland water": ponds, ditches, swamps, marshes, floodplains and rice paddies, shallow and sluggish, warm and often oxygen-poor, with big monsoon swings. That origin explains both the care and the hardiness. A wide-ranging lowland generalist is tolerant of a broad pH, hardness and temperature band, which is the real reason it is beginner-hardy. Still, vegetated water means it wants gentle flow and dense planting, and planting also breaks sightlines to take the edge off male aggression. Oxygen-poor warm water means it carries a labyrinth organ and breathes air at the surface, so it needs a lid, a warm humid air gap and a tank that is not filled to the brim — and it can jump. A warm origin means a heater in most homes.

Did you know?

• Blue, Opaline, Gold, Cosby, Lavender, Platinum and Silver "gouramis" are all the same fish — colour morphs of Trichopodus trichopterus, identical in adult size and temperament, and they interbreed.
• The "three spots" include the eye: there are only two real pigment spots on each flank, and the eye is counted as the third.
• It is one of the world's most-farmed aquarium fish and, in parts of Southeast Asia, a food fish too.
• It breathes air through a labyrinth organ, an adaptation to stagnant lowland water — and the reason a brim-full, lidless tank is wrong.
• Dads do the childcare fiercely, building a bubble nest and aggressively guarding the eggs and fry.
• It has been a model laboratory animal in studies of air-breathing physiology and reproductive behaviour.
• The IUCN assesses it as Least Concern — abundant and widespread.

Tank size — and why

Treat 30 gallons (about 114 L) as the practical floor and 40 gallons or more — a three-foot-plus tank — as the real target, especially for a male or any community. The driver is size plus aggression, not bioload alone: this is a roughly 12 to 15 cm fish that needs swimming length and enough territory and sightline breaks to stop a maturing male from monopolising the tank and bullying everyone in it. Too small a tank concentrates that aggression and risks stunting. Prefer length over height — it is a large, surface-oriented air-breather — and keep it covered with a warm humid air gap, never filled to the brim.

As a guide, a 30-gallon tank comfortably suits about 1 Three-spot (Blue/Opaline/Gold) Gourami as a single-species display, leaving room for tankmates.

How big does it really get?

Full-grown Three-spot (Blue/Opaline/Gold) Gourami reach about 13 cm (5.1 in) long, but they are usually sold at only about 2.5 cm (1 in) — a typical shop size (estimate). At full size, Three-spot (Blue/Opaline/Gold) Gourami needs roughly a 30-gallon tank, about 76 cm long; a common 10-gallon starter kit is only about 51 cm.

Adult size is sourced; the shop size is a typical-juvenile estimate; tank length is approximate for a standard 30-gallon aquarium.

Water parameters in practice

Adaptability is the headline parameter. Its huge wild range and tolerant biology make it one of the least fussy tropical fish on chemistry: FishBase gives pH 6.0 to 8.0 and 22 to 28 °C, Seriously Fish a wider pH 5.5 to 8.5 and hardness 3 to 35 dGH. Aim for about 24 to 28 °C and pH 6.0 to 8.0 and you are well inside the comfort zone, but as always stability, warmth and zero ammonia matter more than hitting a number. A heater is required — it is a warm-water tropical fish, not cold-tolerant. One source note: Seriously Fish's care table shows a garbled "75 to 86 °C" temperature that is plainly a Fahrenheit typo, so use the FishBase 22 to 28 °C range, not the literal figure.

Diet & feeding

In the wild it is a generalised omnivore taking plant matter, algae, aquatic and terrestrial invertebrates, zooplankton and insect larvae. In the tank it is refreshingly unfussy and, in Seriously Fish's words, "will accept most foods offered": a quality omnivore pellet or flake staple, plus live or frozen bloodworm, brine shrimp and daphnia, and some vegetable matter such as blanched veg or spirulina. Feed one or two small portions a day, only what is cleared in a minute or two, and add a weekly fast to head off bloat. Unlike the timid honey gourami, this is a bold, confident, competitive feeder that rarely gets out-competed — if anything it is the one doing the out-competing.

Gear & setup

The core kit is a heater, gentle filtration, a densely planted layout and a lid. Keep flow low to moderate; strong current is unnecessary for a still-water species. Plant densely with floating plants, broad leaves and physical and visual breaks — this is security and aggression mitigation in one, because broken sightlines let subordinates hide and a maturing male has fewer victims in clear view. Keep the tank covered with a warm humid air gap and do not fill to the brim: it is an air-breather and a jumper.

Temperament & behaviour

Lead with the honesty here: this is a semi-aggressive, territorial fish, not a guaranteed-peaceful community centrepiece. AquariumStoreDepot puts it bluntly — "the peaceful community fish label on gouramis is misleading" — and Seriously Fish notes males "are territorial and will squabble amongst themselves" and that some individuals "can become very spiteful as they mature, while others remain peaceful". Temperament is individual and worsens at sexual maturity, so a fish that was fine as a juvenile can become a tank-wide bully. It can and does nip: slow or long-finned tankmates are a target, which is why long-finned, slow species — bettas, angelfish, fancy guppies, and the small slow gouramis such as honey and sparkling — are vetoed from this fish's recommended tankmates regardless of what a coarse size match might suggest. One male per tank is the safest rule; more volume, dense planting and broken sightlines reduce but never eliminate the aggression, while cramped or bare tanks intensify it.

Group & social needs

Not a schooling fish. Keep a single specimen, or one male with several females (a harem) so his attention and aggression are diluted — females are far more peaceable. Multiple males in anything but a very large, heavily-planted tank leads to relentless chasing of the subordinate, so "one male per tank" is the safe default for most setups. Whatever the structure, give it robust, similarly-sized tankmates that can hold their own, and have a plan to separate or rehome a fish that turns into a bully, because even a community that looks fine on paper can break down when a male matures.

Compatible tank mates (preview)

A short, engine-cleared shortlist — the species TankStocking's welfare engine clears with Three-spot (Blue/Opaline/Gold) Gourami and that suit its size and temperament best. Tap any to load the pairing in the planner.

• Bamboo Shrimp (Wood/Fan Shrimp) — Peaceful temperament, similar adult size.
• Boesemani Rainbowfish — Uses the midwater zone, peaceful temperament, similar adult size.
• Bolivian Ram — Uses the bottom zone, peaceful temperament, similar adult size.

One caveat on the shrimp and snails here: engine-cleared means a size, temperament and water-needs fit — it is not a guarantee of safety. An individual Three-spot (Blue/Opaline/Gold) Gourami may still hunt shrimp or pick at small snails, and temperament varies from fish to fish, so add invertebrates cautiously, give them cover, and watch the first encounters.

This engine-cleared shortlist is Three-spot (Blue/Opaline/Gold) Gourami's tankmate surface for now — a dedicated tank-mates guide can follow for high-demand species.

Breeding & sexing

Sexing is straightforward in mature fish, with the dorsal fin the most reliable cue: males have a long, pointed dorsal, females a short, rounded one, and females are deeper- and rounder-bodied, especially when gravid. Colour is unreliable across the morphs. It is an easy bubble-nester: the male builds a large nest, often among floating plants, displays to entice the female, embraces her beneath it, then collects the eggs and guards the nest and fry — turning very aggressive toward the female and everyone else in the process. Trigger spawning with warm water around 27 to 28 °C, a lowered level and floating cover, conditioning both fish on live or frozen food first. Fecundity is very high — Seriously Fish cites 500 to 1200 eggs, other sources up to about 800. Eggs hatch in roughly 20 to 30 hours and the fry are free-swimming a further four to five days later. Remove the female after spawning, and the male once the fry swim free; start the fry on infusoria then baby brine shrimp under a tight warm lid.

Lifespan

Expect about four to six years with good care, and some well-kept fish reach eight — a durable, long-lived species. What shortens it is less fragility (it is hardy) and more chronic poor water quality, cold, overfeeding and bloat, and the stress that comes with its own aggression dynamics, whether that is a bullied tankmate or a lone male harassing the tank. The unusual nuance with this fish is that the bigger welfare risk is often to its tankmates rather than to the gourami itself, so monitor the whole tank, not just the gourami.

Common mistakes

• Believing the "peaceful community gourami" label. It is semi-aggressive, and males get worse with age — this is the single biggest mistake people make with the species.
• Not realising the colour morphs are one species. A "gold", a "blue" and an "opaline" gourami are three of the same large semi-aggressive fish and will likely fight, especially if more than one is male.
• Underestimating the size. A 12 to 15 cm fish bought as a "small community gourami" quickly outgrows nano and community tanks.
• Keeping it with small, timid, slow or long-finned tankmates — small tetras and rasboras, dwarf shrimp, bettas, fancy guppies, angelfish, or the small slow gouramis like honey and sparkling — which it harasses, nips, out-competes or simply eats. These are excluded from its recommended tankmates outright.
• Two or more males together in anything but a very large, heavily-planted tank, which leads to relentless bullying.
• Too small a tank (under about 30 gallons / 3 feet), which concentrates aggression, plus the usual no-heater, brim-full or lidless failures for an air-breathing jumper.

Signs of trouble

• Clamped fins, faded colour and lethargy — usually poor water quality, cold, or stress.
• A tankmate hiding, nipped, frayed or cornered — the welfare problem here is often the gourami's victims, not the gourami.
• Loss of appetite or flashing and rubbing against decor.
• White spots, velvet dusting or fungal or bacterial patches — almost always cold- or stress-triggered.
• A swollen belly or constipation in this enthusiastic eater — vary the diet, add veg and fast weekly.

Is this fish right for you?

Do not buy this fish if you want a guaranteed-peaceful community centrepiece, a small fish, or a calm tankmate for bettas, angelfish, fancy guppies or delicate dwarf gouramis. It needs a 30 gallon-plus (ideally 40-plus), heated, planted tank with one male and robust, similarly-sized tankmates — and a plan to separate a bully. The main ethical issue is the impulse buy: a large, semi-aggressive fish sold under a "peaceful beginner community" label. Stock is generally robust farmed fish, but avoid any dyed or painted gimmick gouramis.

Common questions

Are three-spot, blue, opaline and gold gouramis the same fish?

Yes. Blue, Opaline, Gold, Cosby, Lavender, Platinum and Silver gouramis are all selectively-bred colour forms of one species, Trichopodus trichopterus, with the same adult size of up to 15 cm and the same semi-aggressive temperament. Buying several "different" gouramis usually means several of the same fish, which will likely fight.

Is the three-spot gourami aggressive?

It is semi-aggressive and territorial, and males in particular can become spiteful bullies as they mature. The "peaceful community fish" label is misleading. Keep one male per tank, give it space and dense planting, and have a plan to separate a fish that turns into a bully.

Can a three-spot gourami live with bettas, guppies or angelfish?

No. It nips and harasses slow, long-finned fish, so bettas, fancy guppies, angelfish and the small slow gouramis like honey and sparkling are poor choices and are excluded from its recommended tankmates. Pair it instead with robust, similarly-sized, short-finned fish that can hold their own.

What tank size does a three-spot gourami need?

Thirty gallons is the practical floor, and 40 gallons or a 3-foot-plus tank is the real target, especially for a male or a community. The reason is size plus aggression — it reaches 12 to 15 cm and needs length and territory so a maturing male cannot corner the tank.

What can live with a three-spot gourami?

Robust, similarly-sized, non-timid, short-finned fish: larger or sturdy tetras and barbs in proper groups, larger rasboras, loaches, larger Corydoras, plecos and rainbowfish, in a tank big enough that no one is cornered. Avoid small, timid, slow, long-finned fish and dwarf shrimp.

How big does a three-spot gourami get and how long does it live?

Up to about 15 cm, typically 12 to 13 cm in aquaria — a hand-sized fish, not a nano species. With good care it lives about four to six years, and some reach eight.

Sources & confidence

Sources & confidence (9 species)

These back the Three-spot (Blue/Opaline/Gold) Gourami figures and the previewed tank mates above. Each figure is read from the TankStocking species database (v2026.06); below is the care reference behind it and how confident we are in that data. Confidence reflects the source quality, not whether any pairing is safe. Full source list and the welfare model are on the methodology page.

• Three-spot (Blue/Opaline/Gold) Gourami Trichopodus trichopterus — Seriously Fish (seriouslyfish.com/species/trichopodus-trichopterus) high confidence
• Bamboo Shrimp (Wood/Fan Shrimp) Atyopsis moluccensis — Aquariadise (aquariadise.com/caresheet-bamboo-shrimp-atyopsis-moluccensis) high confidence
• Boesemani Rainbowfish Melanotaenia boesemani — Seriously Fish; Aquarium Co-Op Boesemani guide high confidence
• Bolivian Ram Mikrogeophagus altispinosus — Seriously Fish (seriouslyfish.com/species/mikrogeophagus-altispinosus) high confidence
• Brilliant Rasbora Rasbora einthovenii — Seriously Fish (seriouslyfish.com/species/rasbora-einthovenii) high confidence
• Bristlenose Pleco Ancistrus sp. — Aquarium Source / aqua-fish.net Ancistrus care guides high confidence
• Bronze Corydoras Corydoras aeneus — Seriously Fish (seriouslyfish.com/species/corydoras-aeneus) high confidence
• Clown Pleco Panaqolus maccus — Fish Laboratory (fishlaboratory.com/fish/clown-pleco); AquariumStoreDepot high confidence
• Gold Barb Barbodes semifasciolatus — Fishlore gold barb profile / FishBase Barbodes semifasciolatus high confidence

Care-guide sources (6)

This guide synthesises the references below; where they disagree, the range and the disagreement are noted in the text above. The figures in the key-facts box are read from the TankStocking species database (v2026.06). Full welfare model on the methodology page.

• Seriously Fish — Trichopodus trichopterus — family, Mekong range, lowland biotope, max 15 cm SL / ~12.5 cm in aquaria, 90x30x30 cm footprint, pH 5.5-8.5, hardness 3-35 dH, unfussy omnivore, "males are territorial and will squabble", "can become very spiteful as they mature", robust tankmates only, sexing, bubble-nester, 500-1200 eggs, hatch/free-swimming times (care-table temp is a Fahrenheit typo)
• FishBase — Trichopodus trichopterus — authority (Pallas 1770), 15.0 cm SL, temp 22-28 C, pH 6.0-8.0, dH 5-19, trophic level 2.7, air-breathing, IUCN Least Concern, commercial + aquarium use
• Wikipedia — Three spot gourami — colour morphs (opaline, platinum/silver, blue, gold, lavender/amethyst) all one species, "three spots" = two body spots plus the eye, Trichogaster synonymy, range
• AquariumStoreDepot — Gold Gourami Care — semi-aggressive, "males get territorial", "peaceful community fish label is misleading", one male per tank, 40 gal / 3-ft minimum, ~6 in adult, lifespan 4-6 yr, omnivore + weekly fast, tankmates to avoid (small/timid, rasboras, small tetras, dwarf shrimp), fin-nipping of long-finned/slow fish
• Fishkeeping World / Aquarium Source — Three Spot / Blue Gourami — size ~10-15 cm, lifespan ~4-8 yr, semi-aggressive / fin-nipping potential, harem (one male / several females), tank size, tankmates, breeding, colour forms one species
• FishLore — Blue Gourami care — water 74-82 F, KH 3-35, pH 5.0-8.0, male aggression and fin-nipping, one male per tank, large omnivore

More on Three-spot (Blue/Opaline/Gold) Gourami

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