Chocolate gourami
Sphaerichthys osphromenoides
advanced careOverview
The chocolate gourami (Sphaerichthys osphromenoides) is a small, jewel-like fish, rich brown banded with cream, and a genuine specialist. Native to the soft, acidic peat swamps of Southeast Asia, it demands blackwater conditions and stable, warm, pristine water. Delicate and disease-prone in the wrong setup, it is not a beginner fish — but for the dedicated aquarist who can recreate its habitat, it is a rewarding, unusual mouthbrooding gourami.
Tank & water
A group of six needs a quiet tank of at least 75 litres (20 gallons). Hold a warm 26–30 °C with a gentle filter on soft, very acidic, well-cycled water — many keepers use RO water re-mineralised lightly.
- Blackwater setup: driftwood, leaf litter and botanicals provide the tannins and acidity it needs.
- Dense planting and dim light: cover and subdued lighting reduce stress.
- Rock-stable water: it does not tolerate swings or high nitrate — steady maintenance is vital.
Feeding
As carnivores, chocolate gouramis want small live and frozen foods. Offer frozen and live daphnia, cyclops, brine shrimp, micro-worm and small bloodworm; many individuals ignore dry food entirely, so browse the fish food hub and see our best fish food picks for suitable frozen options. Feed small amounts often and watch that shy individuals are eating.
Tankmates
Peaceful and easily intimidated, chocolate gouramis do best in a species tank or with tiny, gentle blackwater companions such as chili rasboras, ember tetras or small pygmy corydoras. Avoid boisterous, fast or hard-water fish that out-compete them and raise stress. Quiet company in soft water is the key to keeping them healthy.
Frequently asked questions
The chocolate gourami is a beautiful, demanding blackwater specialist for experienced keepers. Provide soft, acidic, warm, stable water and quiet company, and this delicate jewel rewards the effort with fascinating behaviour few aquarists get to see.
Chocolate gourami — frequently asked questions
Why is the chocolate gourami considered difficult?
Because it demands soft, acidic, warm blackwater and is sensitive to poor conditions and stress, which leaves it prone to disease. It is not a fish to add to a standard hard-water community. Experienced keepers who can provide genuine blackwater conditions do best with it.
Does the chocolate gourami need blackwater?
Effectively yes. It thrives in soft, very acidic water stained with tannins from leaf litter and driftwood, mimicking its peat-swamp home. Hard, alkaline tap water is a common reason chocolate gouramis fail, so many keepers use RO water re-mineralised gently and botanicals.
Can I keep chocolate gouramis in a group?
Yes, and you should — a group of six or more helps them feel secure and behave naturally. They are peaceful and non-territorial, and the interesting mouthbrooding behaviour of females is best seen in a settled group in a quiet, well-planted blackwater tank.
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