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Nanochromis teugelsi is a small African cichlid associated with the Congo Basin and, more specifically, Lake Tumba in the Democratic Republic of the Congo. It is rarely offered in the aquarium trade and is mainly sought by keepers interested in specialized species and African biotopes. Its modest size, subdued coloration and territorial behavior make it better suited to a structured display than to a typical community aquarium. This wild-collected species should be acclimated carefully and kept in stable water. With attentive care, it can become a fascinating subject for an aquarium dedicated to small African cichlids.

General species description

Nanochromis teugelsi is a dwarf cichlid of the genus Nanochromis, belonging to the family Cichlidae and the subfamily Pseudocrenilabrinae. The species is characterized by its small size, relatively elongated body and territorial behavior. Like several small African cichlids, it uses shelters and protected surfaces to establish a territory and reproduce. In an aquarium, it requires more planning than an ordinary community fish, especially once a pair forms. Its availability is limited, making it a sought-after species among specialized aquarists. The fish offered are wild-collected; gradual acclimation and quarantine are therefore strongly recommended.

Geographic origin and biotope

Nanochromis teugelsi comes from the Democratic Republic of the Congo, in the Congo Basin, with an origin associated with Lake Tumba. This freshwater environment includes calm shorelines, wooded areas that may flood seasonally and habitats rich in organic matter. The natural setting associated with the species is generally filled with roots, leaf litter and plant debris, providing many refuges. To recreate this atmosphere, use a dark substrate, driftwood, caves and subdued lighting. Gentle to moderate filtration, without excessive current, is more appropriate for a fish associated with a lake and slow-moving habitats.

Precise location and local name

The reference locality for Nanochromis teugelsi is Lake Tumba, in western Democratic Republic of the Congo, within the drainage system of the Congo River. The lake is surrounded by dense equatorial forest and swampy areas, which helps explain the presence of water often colored by plant material. The scientific name is generally used in the specialist trade, without a widely established vernacular name. For aquarists, the Lake Tumba origin is important because it points toward soft to slightly acidic water, a calm setting and a heavily structured aquarium.

Appearance and physical characteristics

Nanochromis teugelsi has a compact, elongated body suited to moving among roots and shelters. Its coloration is dominated by dark tones, with blue or greenish reflections that may intensify depending on mood, lighting and social context. The fins may show stronger contrasts in adults approaching reproduction. As in other Nanochromis, coloration and posture become especially interesting during territorial interactions. The species remains small, but its cichlid behavior requires an aquarium with clearly defined shelter areas. A well-arranged setup makes it easier to observe its metallic reflections and territorial displays.

General diet

In nature, Nanochromis teugelsi searches for small prey and organisms associated with the substrate. In an aquarium, its diet should be varied and made up of small foods suited to its mouth: frozen or live foods such as brine shrimp, daphnia and mosquito larvae, supplemented with a quality small-pellet food. Feed moderate portions to prevent water deterioration, especially in a pair-focused aquarium. Regular small meals support general condition and natural behavior. Protein-rich foods can help condition fish for breeding, but they should not make up the entire diet. The priority is a fine, varied diet offered in small portions.

Essential data

• River of origin: Lake Tumba
• Local name used: Nanochromis teugelsi
• Origin of the scientific name: Nanochromis refers to a small cichlid; teugelsi honors Guy Teugels.
• Etymology of the full name: nano means small, chromis refers to an old fish name, and teugelsi honors Guy Teugels.
• Common/vernacular names: Lake Tumba dwarf cichlid
• Family: Cichlidae
• Subfamily: Pseudocrenilabrinae
• Pronunciation: nan oh KROH miss - toy OOLG see eye
• Discovery: Anton Lamboj, 2005
• Maximum adult size: Approximately 7 cm
• Water temperature and pH: 24 to 28 °C; pH 5.5 to 7.0
• Waterway appearance and surrounding vegetation: Calm water, wooded shorelines, dense vegetation, roots and leaf litter.
• Typical tankmates: Small peaceful fishes from the Congo Basin, depending on aquarium size and pair temperament.
• Temperament and behavior: Territorial and secretive, becoming more intense during breeding.
• Water depth: Shallow shore zones and sheltered areas.
• Sexual dimorphism: Differences may be subtle; mature females may have a stockier profile.
• Bottom structure and flow: Sandy or muddy bottom, plant debris, roots and low flow.

In your aquarium

Success with Nanochromis teugelsi depends more on stability than on advanced equipment. Provide a mature aquarium with spawning caves, roots and several visual barriers to reduce conflict. Soft, slightly acidic to neutral water, a stable tropical temperature and filtration without strong current suit its origin. Because this species is wild-collected and relatively uncommon in the trade, avoid sudden changes and provide a varied diet. A pair may become territorial, so adequate space and a carefully structured layout are essential for long-term success.