Red-line dwarf cichlid

Geographical Origin and Habitat: This species is native to the Amazon basin, specifically the Madre de Dios River system in Peru and Bolivia. It inhabits slow-moving forest streams, shaded creeks, and shallow shorelines dense with leaf litter, where the water is extremely soft, acidic, and stained tea-color with organic tannins.

Taxonomy and Morphology: Belongs to the family Cichlidae, subfamily Geophaginae. It is a small cichlid with an elongated body; males reach about 5.5 cm in length, whereas females remain smaller, topping out around 3.5 cm. It is characterized by parallel horizontal red lines running along the flanks of mature males.

Social Behavior: A territorial yet generally peaceful species when kept with non-conspecific fish of similar size. Males establish individual territories that they defend vigorously, especially during the spawning phase. Keeping them in pairs or small harems is highly recommended in appropriate aquariums.

Coloration and Sexual Dimorphism: Sexual dimorphism is highly pronounced. Males are larger, with longer and more pointed dorsal and anal fins, displaying brilliant coloration with characteristic red stripes and blue iridescent scales. Females are smaller and mostly greyish-yellow, but turn bright yellow with black patterns when breeding.

Aquarium Setup: Requires a tank of at least 60-80 liters for a pair. The ideal substrate should be fine, dark sand, with an abundance of hiding places such as driftwood, roots, coconut shells, and smooth rocks forming caves. Adding dried catappa leaves helps replicate the natural humic conditions of their habitat.

Diet and Feeding: A carnivorous species that prefers live or frozen foods such as brine shrimp, bloodworms, daphnia, and copepods. They can be accustomed to high-quality dry micro-granules designed for dwarf cichlids, but a varied diet rich in fresh foods is essential to stimulate breeding and maintain vibrant colors.

Water Quality: Demands clean, soft, and acidic water. Ideal parameters are: temperature between 23 and 28 °C, pH range of 5.0 to 6.5, general hardness GH below 5 dGH, and carbonate hardness KH below 3 dKH. Nitrate and phosphate levels must be kept close to zero through regular, small water changes.

Compatibility and Cohabitation: Excellent occupant for geographical community aquariums. Cohabits well with small characins (such as pencilfish or tetras) that act as dither fish in the upper water column. Avoid highly active or aggressive bottom-dwellers (like large loaches or catfish) that might invade their territory.

Aquarium Breeding: Cave spawners. The female deposits eggs inside a cave or cavity and takes sole responsibility for guarding the clutch and fry, while the male patrols the outer territory. Very soft, acidic water (pH around 5.5) is absolutely crucial for the eggs to hatch successfully.

Risks and Diseases: Highly sensitive to poor water quality and the accumulation of organic waste, which can trigger hole-in-the-head disease or bacterial infections. They are also vulnerable to intestinal parasites and ich. Avoid sudden parameter shifts and closely monitor water chemistry.