Guianacara cuyunii

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The Red Cheek, also known by the scientific name Guianacara cuyunii, is a small South American cichlid from the Cuyuni River basin in Guyana. Its appeal comes from its reddish cheeks, relatively peaceful cichlid behavior, and interest for aquarists looking for an uncommon species. This fish is best kept in a well-planned aquarium because its territorial behavior becomes stronger when a pair forms or spawning begins. It is a very rare species in the aquarium trade, offered exclusively by Ton.Fish in Canada and originating from wild-collected specimens.

General species description

Guianacara cuyunii is a medium-sized cichlid for a South American aquarium, recognized by its compact body, rounded head, and reddish cheek markings. It spends much of its time near the bottom and in quieter parts of streams, inspecting the substrate for food. Its behavior is generally calmer than that of many larger cichlids, but it becomes territorial when a pair forms. A structured layout with rocks, roots, and shelters helps reduce conflict. Because it is very rare in the hobby, it is best suited to an aquarist who wants to observe an unusual species rather than add it to an improvised community aquarium.

Geographic origin and biotope

Country of reference: Guyana. Guianacara cuyunii comes from the Cuyuni River basin in northeastern South America. This region contains tropical streams bordered by forest, with rocky or sandy sections and substantial bankside vegetation. The water may be clear to lightly tinted by organic material from the surrounding forest. In the aquarium, provide soft, stable, well-oxygenated water and a tropical temperature of 24 to 28 °C. Regular water changes are especially important for this wild fish, which does not respond well to sudden changes in water quality.

Precise location and local name

The known range of Guianacara cuyunii is associated with the Cuyuni River and its drainage system in Guyana. The most widely used local or trade name in the aquarium hobby is Red Cheek, referring to the coloration of the cheeks. This common name is useful in the trade, but it does not replace scientific identification, especially among South American cichlids whose colors may change with mood, stress, or breeding condition. Wild specimens may also show differences in coloration related to their precise collection locality.

Appearance and physical characteristics

The body of Guianacara cuyunii is moderately deep and laterally compressed, with a proportionate head and well-developed fins. The base color ranges from beige to brownish gray, often with bluish or greenish reflections. Its most distinctive feature is the red or copper coloration on the cheeks, especially visible in healthy adults. A dark body band may appear depending on the fish’s emotional state. The fins can show subtle edging or highlights. Adult size remains moderate, but an aquarium with generous floor space is necessary for the expression of its natural foraging and territorial behavior.

General diet

In nature, Guianacara cuyunii searches for food in the substrate by taking small mouthfuls of sand or fine debris. Its diet is mainly made up of small invertebrates, larvae, and bottom-dwelling organisms, along with various organic materials. In the aquarium, it accepts quality cichlid pellets, but its diet should be varied with frozen foods such as brine shrimp, bloodworms, and small aquatic prey. Small portions offered regularly are preferable to overly large meals. A varied diet supports the development of the cheek coloration and overall condition, although it cannot replace stable water and careful maintenance.

Essential data

• Name of the river of origin: Cuyuni River
• Local name used: Red Cheek
• Origin of the scientific name: The genus name refers to the Guiana region and a vernacular name for a cichlid; the species name refers to the Cuyuni.
• Etymology of the full name: Guianacara approximately means “acara from Guiana”; cuyunii means “from the Cuyuni.”
• Common/vernacular names: Red Cheek
• Family: Cichlidae
• Subfamily: Cichlinae
• Pronunciation of the name: gwee-ah-nah-KA-ra - koo-yoo-NEE
• Discovery: Sven O. Kullander and Han Nijssen, 1989
• Maximum adult size: About 12 cm
• Water temperature and pH: 24 to 28 °C; pH 5.5 to 7.0
• Stream appearance and surrounding vegetation: Tropical forest streams with rocky or sandy sections and dense bankside vegetation.
• Typical tankmates: Peaceful South American cichlids of similar size, sturdy small characins, non-territorial bottom fish, and loricariids suited to soft water.
• Temperament and behavior: Relatively peaceful, substrate-sifting, and territorial as a pair or during spawning.
• Water depth: Marginal areas and shallow to moderately deep sections.
• Sexual dimorphism: Limited outside the breeding period; mature males may be more robust.
• Bottom structure and flow: Sand, fine gravel, and rocks, with low to moderate flow.
• Ton.Fish status: Wild-collected species, very rare in the aquarium trade, and exclusive to Ton.Fish in Canada.

In your aquarium

To keep Guianacara cuyunii successfully, provide a spacious aquarium with generous floor area, soft and stable water, and a layout made of roots, rocks, and shelters. Fine sand suits its substrate-sifting habits. Maintain effective filtration without excessive current and avoid aggressive tankmates. Since these fish are wild-collected and very rare, careful acclimation, a varied diet, and excellent water quality are essential. The exclusive Canadian availability through Ton.Fish offers the opportunity to keep an unusual species, but it deserves consistent care and a thoughtful setup.