Chocolate Gourami
Sphaerichthys osphromenoides
Min Tank Size
60L
Adult Size
4.5 cm
Lifespan
5 years
School Size
6+
About
Chocolate gouramis come from the peat swamps and blackwater streams of Southeast Asia, particularly the Malay Peninsula, Sumatra, and Borneo. 0, and virtually zero carbonate hardness. Replicate that in your living room and you've earned the right to keep one of the hobby's most beautiful small fish.
The coloration is genuinely striking up close. The body is a warm chocolate brown overlaid with cream or pale yellow vertical bars and a subtle iridescence that catches light in dim setups. 5 cm, and move slowly and deliberately through the lower half of the water column.
Feeding them isn't overly complicated once settled, they accept small live and frozen foods like daphnia, baby brine shrimp, and micro worms, though they're often reluctant to eat dry food at first. The real challenge is the water. You'll need RO or rainwater remineralized to near-zero hardness, and the tank should be heavily tinted with Indian almond leaves, alder cones, or peat filtration.
Any ammonia spike, any sudden pH shift, any trace of unsuitable minerals, and these fish will start refusing food and slowly deteriorate. They're genuinely not forgiving.
But for keepers willing to build a dedicated blackwater biotope setup, few fish reward that effort as elegantly. Browse real tank builds featuring this species for setup inspiration.
Water Parameters
Temperature
°CpH
GH
dGHKH
dKHSwimming Level
Flow Preference
Keeping multiple Chocolate Gourami together
Chocolate Gourami are shoaling fish and need company of their own kind. Keep a group of at least 6. Smaller groups leave them stressed, washed-out in color, and prone to hiding.
Compatibility
These fish need very specific tankmates because the water parameters required to keep them healthy will harm or kill most common community species. Suitable companions are limited to other blackwater-adapted fish that thrive in soft, acidic conditions: dwarf rasboras like Boraras brigittae or B. maculatus, small pencilfish such as Nannostomus mortenthaleri, ember tetras, and similar diminutive species. Avoid anything boisterous, nippy, or water-chemistry incompatible. Bettas are not ideal despite sharing some parameter overlap, the risk of fin-nipping stress is too high. Small Corydoras species adapted to soft water can work. Neocaridina shrimp won't survive the required pH, but Caridina shrimp suited to acidic conditions are sometimes kept alongside them with mixed results.
Commonly kept with
Species this one is most often paired withCommonly tried but avoid
Often paired, but shouldn't beCare Notes
The single biggest failure mode with chocolate gouramis is attempting to keep them in inadequately prepared tap water. Most municipal water is far too hard and too alkaline, even after partial treatment. RO water blended with blackwater additives or pure rainwater is essentially non-negotiable. New fish, especially wild-caught specimens, often refuse to eat for weeks and should be offered live foods exclusively at first. Established biological filtration is critical before adding them since they're highly ammonia-sensitive. A tight-fitting lid matters too, they're capable jumpers despite appearances. Don't rush acclimation or cut corners on water chemistry.
Behavior & Aggression
Chocolate gouramis are peaceful fish by nature and pose no real threat to appropriately sized tankmates. Males can show mild territorial displays toward one another during breeding condition, mostly consisting of flaring and posturing rather than actual biting. This rarely escalates to injury if the tank has enough space and visual breaks. The bigger concern is their extreme vulnerability to stress-induced suppression of immune function rather than any aggression they dish out. Keep the group dynamic calm and avoid anything that chases or harasses them.
Things to Know
- Mouthbrooder, female broods eggs
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