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Krobia xinguensis, also called Red Cheek, is a South American cichlid associated with the Rio Xingu in Brazil. Its common name refers to the reddish coloration visible on the cheeks, especially when the fish is in good condition. This species remains uncommon in the aquarium trade, making it an interesting choice for aquarists seeking an unusual cichlid. It requires warm, clean and well-oxygenated water, together with a layout offering rocky shelters and visual boundaries. Like many territorial cichlids, it becomes more expressive and defensive during spawning.

General description

Krobia xinguensis is a medium-sized cichlid of the genus Krobia, recognized by its sturdy body, relatively broad head and well-developed fins. It inhabits areas where rocks, crevices and current shape the environment. In an aquarium, it may be kept as an established pair or as a group of juveniles, with the arrangement adjusted as territories develop. Its behavior is generally active, alert and territorial, without resembling that of large predatory cichlids. Water quality, bottom space and suitable shelters are essential for long-term stability.

Geographic origin and biotope

This species originates from Brazil, in the Rio Xingu basin. Its natural environment consists of soft to slightly mineralized, warm and well-oxygenated water, often associated with rocky outcrops and moderate to strong flow. The bottom may include stones, gravel and sand deposited in calmer areas. Aquatic vegetation is not necessarily dense in rocky habitats, while riparian vegetation and submerged branches provide shade and shelter. An aquarium that reproduces this structure is more appropriate than a very densely planted and uniform layout.

Precise location and local name

The reference locality is the Rio Xingu, in Pará State in northern Brazil, within the Amazon region. The most common vernacular or trade name associated with the species is Red Cheek, an English name referring to its facial coloration. Within the Xingu drainage, the species is associated with rocky bottoms and areas offering natural shelter. For aquarists, this origin points to the importance of good water movement, a mineral-based layout and efficient filtration.

Appearance and physical characteristics

The body of Krobia xinguensis is oval and laterally compressed, with a brownish, greyish or olive base coloration that may intensify according to mood and social context. The cheeks show a distinctive reddish tone, which gives rise to the name Red Cheek. The fins may display red, orange or bluish shades, particularly in dominant adults and breeding fish. Body markings can change with age, social rank and spawning condition. The reddish cheeks and compact body shape are the most useful features for recognizing this species.

General diet

In the wild, Krobia xinguensis presumably feeds on small benthic prey, crustaceans, aquatic larvae and other organisms found in the substrate, while also taking plant material or detritus. In an aquarium, offer a varied diet based on quality cichlid pellets, frozen foods such as brine shrimp, mysis or mosquito larvae, and other suitably sized meaty foods. Meals should remain moderate to prevent obesity and water pollution. A varied diet supports coloration, growth and breeding condition.

Essential data

• Native river: Rio Xingu
• Local name used: Red Cheek
• Origin of the scientific name: Krobia is a vernacular name used for cichlids and adopted as a genus name; xinguensis indicates origin in the Xingu basin.
• Etymology of the full name: Krobia identifies the genus; xinguensis means from the Xingu.
• Common/vernacular names: Red Cheek
• Family: Cichlidae
• Subfamily: Cichlinae
• Name pronunciation: KROH-bee-ah - zin-goo-EN-sis
• Discovery: Sven O. Kullander, 2012
• Maximum adult size: About 15 cm
• Water temperature and pH: 24 to 28 °C; pH 6.0 to 7.5
• Watercourse appearance and surrounding vegetation: Warm, clear water, rocky areas, moderate to strong flow, riparian vegetation and submerged branches.
• Typical tankmates: Acarichthys heckelii, Hypancistrus zebra L-046, Baryancistrus chrysolomus L-047, Hemiodus gracilis
• Temperament and behavior: Active, territorial and more defensive during breeding; provide visual barriers and several shelters.
• Water depth: Shallow to medium-depth shoreline and rocky areas.
• Sexual dimorphism: Adult males may be larger and more colourful; differences are variable.
• Bottom structure and flow: Rocks, gravel and sand, with moderate to strong current and good oxygenation.

In your aquarium

Keeping Krobia xinguensis successfully requires a spacious aquarium arranged with stable rocks, cavities and retreat areas. Efficient filtration, warm water and regular circulation help reproduce the conditions of the Rio Xingu. Because this species is wild collected, careful acclimation and quarantine are sensible practices. Its intermediate rarity in the trade also makes it worthwhile to choose vigorous specimens and maintain them responsibly. Territorial conflicts should be monitored, particularly when a pair forms and spawning begins.