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The kissing gourami is named for the distinctive mouth-to-mouth contact it makes with other fish of its kind. This behaviour is not affectionate: it is a display of dominance and competition, where two fish lock lips and push against each other to establish hierarchy. New keepers who buy a pair expecting peaceful romance sometimes find themselves managing a surprisingly assertive fish. With the right tank size, the right companions, and a diet that accounts for their primarily plant-based appetite, kissing gouramis are rewarding, long-lived fish that bring genuine personality to a large freshwater setup.
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Table of Contents
Quick Facts
| Common name | Kissing gourami, kisser fish |
|---|---|
| Scientific name | Helostoma temminckii |
| Origin | Southeast Asia (Thailand, Java, Borneo, Sumatra) |
| Adult size | 8–12 inches (20–30 cm); usually 6–8 inches in captivity |
| Minimum tank size | 55 gallons for one; 75 gallons for a pair |
| Temperature | 72–82°F (22–28°C) |
| pH | 6.0–8.0 |
| Hardness (GH) | 5–20 dGH |
| Lifespan | 5–7 years (up to 10 in ideal conditions) |
| Temperament | Semi-aggressive; may harass similar-shaped fish |
| Diet | Omnivore with herbivore bias; algae, plant matter, pellets |
| Care level | Beginner-friendly with the right tank size |
The Labyrinth Organ: What Beginners Need to Know
Kissing gouramis are labyrinth fish, a group that includes bettas and other gouramis. The labyrinth organ is a specialised respiratory structure in the gill chamber that allows these fish to absorb oxygen directly from atmospheric air. This evolved in the slow, heavily vegetated, often oxygen-depleted waters of Southeast Asia. In your tank, kissing gouramis will regularly surface to gulp air. This is normal and healthy. Do not mistake surface-gulping for an oxygen problem unless it is accompanied by laboured gill movement and lethargy in all tank inhabitants.
The labyrinth organ means kissing gouramis are tolerant of temporarily degraded water quality, but this tolerance should not be used as a reason to neglect maintenance. Poor water quality over time still causes chronic stress, fin damage, and shortened lifespan.
Appearance
Kissing gouramis have a deep, laterally compressed body, a pointed dorsal fin, and a distinctive set of thick, permanently pursed lips lined with small comb-like teeth called denticles. These teeth allow them to rasp algae and biofilm from hard surfaces efficiently. The wild form is olive green to grey with a metallic sheen. The “pink” kissing gourami, more accurately a leucistic morph, is cream to pale pink and is the variety most commonly sold in fish stores. A green form retains the natural olive colouration and is less commonly available.
Sexing kissing gouramis is genuinely difficult and not reliably possible by visual inspection alone. Mature females are sometimes slightly rounder in the abdomen when viewed from above, particularly before a spawn. In most store-bought fish, determining sex before maturity is not practical.
Water Parameters
| Parameter | Acceptable range | Optimal |
|---|---|---|
| Temperature | 70–85°F (21–29°C) | 75–80°F (24–27°C) |
| pH | 6.0–8.0 | 6.8–7.5 |
| Hardness (GH) | 5–25 dGH | 8–15 dGH |
| Ammonia / Nitrite | 0 ppm | 0 ppm |
| Nitrate | <40 ppm | <20 ppm |
Kissing gouramis are adaptable to a wide range of water chemistry. Most neutral to slightly alkaline tap water in the US, UK, and Australia sits comfortably within their tolerance. The parameter that causes the most problems when it drifts is temperature. These are warm-water fish; sustained temperatures below 70°F slow their metabolism, suppress immune function, and make them vulnerable to velvet and other parasites. Use a reliable heater set to 77°F as a default, and verify with a separate thermometer.
Kissing gouramis produce significant waste as large, plant-heavy eaters. Bioload is higher than many comparably-sized fish. Strong biological filtration with weekly 25–30% water changes keeps nitrates under control. The thick plant matter in their diet breaks down quickly in the substrate; a gravel vacuum at water changes is important to prevent anaerobic pockets forming in sand or mulm buildup in gravel.
Tank Size and Setup
A 55-gallon tank is the minimum for a single adult kissing gourami. This is not an exaggeration: these fish reach 8 inches in captivity and are active swimmers. A pair requires 75 gallons to provide enough territory that the dominant fish does not spend all its energy chasing the subordinate. The extra volume also makes water parameter management significantly easier for a large bioload fish.
- Plants: Kissing gouramis will graze on soft-leaved plants. Use robust plants like Anubias, Java fern, or artificial plants for structure. Plant-heavy setups require regular trimming and plant replacement.
- Substrate: Fine gravel or sand. Kissing gouramis are not aggressive substrate disturbers; either works well.
- Flow: Moderate. They come from slow to moderately flowing water. Avoid strong powerhead currents that force them to fight the flow constantly.
- Algae surfaces: Flat rocks, driftwood, and smooth décor allow kissing gouramis to exhibit their natural rasping behaviour. A healthy algae presence on surfaces enriches their environment and supplements their diet.
- Lid: Required. Kissing gouramis can jump from open tanks, especially when startled.
Tank Mates
Kissing gouramis are semi-aggressive toward fish with similar body shapes. They will initiate “kissing” contests with other flat-bodied, disc-shaped fish, which can exhaust and stress the recipient. In a community tank, choose companions with different body shapes.
Avoid: Other flat-bodied gouramis (pearl, moonlight, giant gouramis), discus, or any disc-shaped fish that will be targeted for prolonged lip-locking. Also avoid small, delicate species that cannot handle the assertive energy of kissing gouramis.
Good tank mates:
- Larger barbs: Tiger barbs, rosy barbs, tinfoil barbs (all fast-moving, similar size range)
- Larger tetras: Buenos Aires tetras, Congo tetras
- Robust cichlids: Firemouth cichlids, severums (avoid highly aggressive species)
- Large plecos: Common pleco, sailfin pleco (they share the algae grazing niche harmoniously)
Feeding
Kissing gouramis are primarily herbivores in the wild, using their uniquely adapted lips and denticles to scrape algae and biofilm from surfaces, filter phytoplankton from the water column, and graze on aquatic vegetation. In captivity, they accept a wide range of foods but need a plant-based diet to stay healthy long-term. A diet heavy in protein without plant matter leads to digestive issues and fatty liver over time.
- Base diet: Spirulina-based flakes or algae wafers, twice daily
- Protein rotation: Frozen brine shrimp or daphnia, 2–3 times per week; avoid high-protein foods as the primary diet
- Vegetable supplement: Blanched zucchini, cucumber, spinach, or peas, 3–4 times per week
Feed small amounts twice daily rather than a large single feeding. Kissing gouramis are continuous grazers by nature. Overfeeding leads to bloat and degrades water quality rapidly given their already substantial bioload. If blanched vegetables are accepted, these can stay in the tank for up to 24 hours before removal.
Breeding
Kissing gouramis are egg scatterers. Breeding in a home aquarium requires a large setup and distinct conditioning. Unlike some labyrinth fish, kissing gouramis do not build bubble nests; the male fertilises eggs as the female scatters them near the surface, and the eggs float freely until they hatch.
- Conditioning: Feed live or frozen protein-rich foods (brine shrimp, daphnia) for 2–3 weeks alongside plant-based foods
- Setup: Raise temperature to 80–82°F; floating plants provide surface cover where eggs collect
- After spawning: Remove adults immediately; eggs are buoyant and float on the surface; they hatch in 24 hours
- Fry first foods: Infusoria for the first 5–7 days; then newly hatched brine shrimp and micro-algae; fry are tiny and need microscopic food at first
Common Problems
- Aggression toward similar species: The lip-locking behaviour is not play. Extended bouts exhaust the weaker fish. If one kissing gourami is persistently targeting another, add visual barriers or separate them.
- Plant destruction: Kissing gouramis will consume soft-leaved plants rapidly. Replace with artificial plants or robust species like Anubias if the tank is constantly being stripped.
- Ich: Visible white spots on fins and body. Raise temperature to 82°F gradually and treat with a standard ich medication. Kissing gouramis are not particularly sensitive to medications.
- Bloat from high-protein diet: A swollen abdomen in a kissing gourami often indicates dietary imbalance. Shift the diet toward algae wafers, spirulina, and blanched vegetables. Reduce or eliminate bloodworms as a staple.
- Laboured surface breathing: Unlike the normal air-gulping of a labyrinth fish, laboured breathing with rapid gill movement and lethargy indicates a water quality or disease issue. Test immediately for ammonia, nitrite, and nitrate.
Frequently Asked Questions
Why do kissing gouramis kiss each other?
The “kissing” is a dominance behaviour, not affection. Two kissing gouramis lock lips and push against each other to establish which fish is dominant in a given territory. It can look playful but is actually competitive. Extended bouts (lasting more than a few seconds repeatedly) can stress the subordinate fish. If one fish is clearly losing every encounter, consider separating them or adding more tank space.
How big do kissing gouramis get?
In the wild, kissing gouramis reach 12 inches. In captivity, most reach 6–8 inches in a well-maintained tank. Growth rate slows considerably after the first two years. Providing a large tank (55+ gallons) and a balanced diet gives them the best chance of reaching a healthy adult size without stunting.
Can kissing gouramis live with bettas?
No. Kissing gouramis will target bettas with their lip-locking behaviour. Bettas are also significantly smaller, making them vulnerable to fin damage during encounters. The similar flat body shape of the betta triggers the kissing gourami’s competitive instinct. Keep kissing gouramis with larger, differently shaped species that will not trigger this response.
What do kissing gouramis eat?
Kissing gouramis are primarily herbivores. Their best diet centres on spirulina flakes or algae wafers as a base, supplemented with blanched vegetables (zucchini, peas, spinach) and occasional frozen brine shrimp or daphnia. Avoid making bloodworms or other high-protein foods the staple; this leads to digestive problems over time in a fish evolved for a plant-heavy diet.
Equipment Recommendations
Kissing gouramis need a heater that holds a stable 75–80°F reliably. These are warm-water fish, and temperature drops below 70°F cause health problems quickly. Our best aquarium heater guide covers reliable, fully submersible options for 55–100 gallon tanks.
For filtration, kissing gouramis produce significant waste as large, plant-grazing fish. A canister filter provides the biological capacity needed for their bioload while keeping the tank well-oxygenated. Our best canister filter guide includes reviewed options for different tank sizes and flow rate requirements.
Don’t leave your kissing gourami’s water quality unmonitored. Test monthly with a complete aquarium test kit to track nitrates from their heavy bioload. Start with the right filtration and a plant-based diet, and kissing gouramis will thrive in your tank for 7 years or more.