Pearl Gourami Care Guide

Give a pearl gourami a calm, dim, heavily planted tank and it earns its 'lace' and 'mosaic' nicknames — a silvery body dusted with iridescent pearling, a male blushing orange across the breast. Put the same fish in a bright, bare tank and you get a washed-out ghost that hides all day. This is the larger gourami, deep-bodied and genuinely peaceful, but genuinely shy: with this species, looks and confidence are husbandry, not luck.

Pearl Gourami at a glance

The sourced figures the welfare engine uses to judge Pearl Gourami — the parseable key facts.

Where it comes from

In the wild, Trichopodus leerii works the lowland peat swamps and sluggish streams of the Malay Peninsula, Thailand, Sumatra and Borneo — soft, acidic, tea-stained blackwater so choked with vegetation that little current and little light get through. Read the care sheet backwards from that home: still water calls for low flow and heavy planting; oxygen-poor swamp water explains the labyrinth organ and the daily trips to the surface for air; and a shaded, tannin-stained world explains a fish that wants dappled light and floating cover overhead. Drop it under bright, open lighting and it reads the tank as exposed and bolts. Soft, slightly acidic water flatters wild-type colour and triggers spawning, though tank-bred stock shrugs off a much wider range.

Did you know?

• It has 'taste-buds on a string': the long thread-like ventral fins are modified sensory feelers covered in touch receptors and taste buds, which the fish trails over plants, food and tankmates to feel and taste its surroundings.
• It breathes air through a labyrinth organ, an adaptation to oxygen-poor swamp water.
• The 'pearls' name the fish: its body is dusted with iridescent white pearl/mosaic spots, hence Pearl, Lace, Mosaic and Diamond Gourami.
• Males blush red to breed, flushing a vivid orange-red throat and breast and flaring elongated fins.
• A bubble-nest dad: the male builds a floating nest up to about 25 cm across and guards eggs and fry.
• Hobbyists use pearls as a 'secret weapon' against hydra infestations that resist other controls.
• FishBase lists the species as Near Threatened (IUCN, assessed 2019), worth knowing for a common aquarium fish.

Tank size — and why

Size is where most pearl gourami plans go wrong. This is a deep-bodied fish of about 12 cm — visibly bigger than dwarf and honey gouramis — so roughly 30 US gallons (about 114 L) is the practical floor for one or a pair, 40 gallons-plus is more comfortable, and a proper group wants a four-foot tank. Footprint earns its keep three ways: open surface area for a fish that breathes air at the top, water volume to dilute a medium bioload, and horizontal room so a shy fish and squabbling males can put scenery between themselves. It carries some height, so a tank with both decent depth and a long base suits it — but if you have to choose, take length and surface over a tall, narrow column.

As a guide, a 30-gallon tank comfortably suits about 1 Pearl Gourami as a single-species display, leaving room for tankmates.

Water parameters in practice

Hold the tank at 25-28 °C; pearls tolerate roughly 24-30 °C, and here the sources part company — FishBase caps its recommended band at 28 °C while Seriously Fish allows up to 30 °C. Aim for pH 6.0-7.5, with room from about 5.5 (the soft, acidic wild end) to 8.0, and don't fret over hardness, which they take from soft to moderately hard. Tank-bred pearls are forgiving on chemistry, so the thing that actually moves the needle is a cycled tank holding steady and warm; soft, slightly acidic, tannin-stained water is the bonus that mirrors the swamp and tips them toward spawning.

Diet & feeding

An omnivore that leans insectivore, the wild pearl gourami picks at small invertebrates, insect larvae, zooplankton and a little plant matter — and it inspects food the way it inspects everything, trailing its thread-like feelers over it first. In the tank it is unfussy: a quality flake or micro-pellet base, plus live or frozen bloodworm, brine shrimp and daphnia, with the odd scrap of blanched courgette. Feed small amounts one to three times a day, only what clears in a minute or two. One party trick worth knowing — pearls are among the best fish for grazing down a hydra outbreak, and hobbyists keep them as living pest control; that is shop-floor experience, not a published study, so treat it as a bonus rather than a guarantee.

Gear & setup

Run a heater, a fully cycled tank and gentle filtration — a sponge filter or a baffled outflow — keeping flow low to echo the still swamp. Plant heavily and float plants across the top to break up the light: pearls want it dim and dappled, and a bright, bare tank hands you back a withdrawn, washed-out fish. Keep a lid on, but leave a warm, humid pocket of air below it and stop short of filling to the brim — the labyrinth organ has to reach surface air, and a startled gourami can jump.

Temperament & behaviour

On every shortlist of the most peaceful gouramis, and a fine community fish — but timid with it. House it with boisterous tankmates or strand it in a bright, bare tank and it simply withdraws; give it cover and it comes back out. The friction that does exist is internal: males hold territory against each other and lean hard on females in breeding mood, so same-species tension is mild but real, not zero. It settles fastest alongside calm company that uses the rest of the tank — peaceful bottom dwellers such as corydoras sit well below it. Midwater schoolers such as harlequin rasboras fill the gap between, and a secure pearl soon colours up and stops hiding.

Group & social needs

It isn't an obligate shoaler, yet it fares better in a small, female-skewed group than kept solo. The structure that works is one male to two or three females: it spreads the male's attention and damps down male-male squabbling. A single fish gets by, but a thought-through group of four or more on that ratio is the stronger setup, and it keeps breeding-season pestering off any one female.

Compatible tank mates (preview)

A short, engine-cleared shortlist — the species TankStocking's welfare engine clears with Pearl Gourami and that suit its size and temperament best. Tap a name for its care guide, or use + to load the pairing in the planner.

• Bamboo Shrimp (Wood/Fan Shrimp)+Peaceful temperament, similar adult size
• Bleeding Heart Tetra+Uses the midwater zone, 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
• Brilliant Rasbora+Uses the midwater zone, peaceful temperament, similar adult size
• Bristlenose Pleco+Uses the bottom zone, peaceful temperament, similar adult size
• Bronze Corydoras+Uses the bottom zone, peaceful temperament, similar adult size
• Celebes Rainbowfish+Uses the midwater zone, peaceful temperament, similar adult size

A note on the shrimp and snails here: Pearl Gourami is peaceful and generally invertebrate-safe — but almost any fish will take very small shrimplets given the chance, so give shrimp dense cover (moss, leaf litter) if you want a colony to grow, rather than expecting every baby to survive.

See the full Pearl Gourami tank mates guide →

Breeding & sexing

Mature fish are easy to sex. Males flush a red-orange throat, breast and belly (most intense in breeding dress) and carry a longer, pointed dorsal and a drawn-out, filamentous anal fin; females stay plainer, plumper and round-bellied with shorter fins. Ignore the thread-like ventral feelers as a clue — both sexes wear them. Spawning itself is rated easy, the classic bubble-nest routine: condition the pair on live or frozen food, then drop the water level, warm it to around 28 °C and add floating plants. The male builds a sprawling surface nest — up to about 25 cm across — wraps around the female, gathers the falling eggs and stands guard. Run one male to two or three females and lift the female out once she has spawned, because the male turns rough. Expect roughly 200-300 eggs, hatching in about 20-30 hours, with fry free-swimming four to five days after that. The fry breathe through gills until the labyrinth organ forms, so keep their tank warm, humid and tightly covered.

Lifespan

Four to five years is the figure to plan around. Some fish push past six, though that is uncommon, and the louder claims of 5-8 years or even a decade-plus rest on single, optimistic sources — FishBase doesn't publish a maximum age for the species at all. What trims those years is predictable: poor or swinging water quality, the chronic stress of a tank that is too small, too bright or too bare, bullying tankmates, and disease — and this is a fish that catches velvet more readily than most.

Common mistakes

• Underestimating its size and space needs: it is bigger than dwarf and honey gouramis (about 12 cm) and needs roughly 30 gallons-plus and a long footprint, not a nano tank.
• Using a bright, bare tank, when floating plants, dim light and cover are husbandry, not optional decor.
• Overfilling the tank or skipping the surface air gap, when an air-breather must reach humid surface air.
• Housing it with fin-nippers or boisterous fish, which shred its long fins and feelers or bully it into hiding.
• Keeping multiple males in too small a tank instead of a 1 male to 2-3 female ratio with space.
• Letting water go cold or unstable, which drives velvet, ich and fin rot in this velvet-prone fish.
• Mixing it with sketchy dwarf gourami stock, which risks iridovirus exposure.

Signs of trouble

• Hiding and withdrawal, and faded colour.
• Clamped fins and lethargy.
• Appetite loss.
• Flashing or rubbing against surfaces.
• A fine gold or rust 'dusting' (velvet, to which pearls are especially prone), or white spots (ich).

Is this fish right for you?

Skip this fish if you can't give it a heated, cycled, 30-gallon-plus planted tank with cover, dim light and a calm community; it is a centrepiece community fish, not a nano or bowl occupant. Pearls are hardy by gourami standards, but they are notably velvet-prone, so cold or unstable water is the one risk you most need to design out. Here is the part worth understanding: the pearl is not the inbred dwarf gourami and is not a primary iridovirus reservoir — the very reason it is sold as the hardier, safer big-gourami choice. Even so, a virus-carrying dwarf gourami can still infect other gouramis around it, and with an estimated 20-50% of pet-shop dwarf gouramis carrying it, the sensible move is well-coloured, lively stock kept clear of suspect dwarf-gourami tanks.

Common questions

Sources & confidence

More on Pearl Gourami

Related guides on TankStocking — each scored by the same welfare engine as the planner.

This care guide is a sourced planning reference, not veterinary advice — individual fish, filtration and maintenance all matter. Cycle the tank, test your water, and observe your fish. How TankStocking works →