Geophagus brasiliensis

Geophagus brasiliensis is native to coastal rivers of eastern Brazil, ranging from Espirito Santo to Rio Grande do Sul, and extending into Uruguay and Argentina. Unlike many of its Amazonian relatives, it inhabits clear, moderately hard, slightly acidic to alkaline coastal rivers and lake systems, and is notably more tolerant of cooler temperatures and harder water than typical Geophagus species.

The Pearl Cichlid is a large, robust fish reaching up to 25 cm, with a moderately compressed body and a distinctive elongated snout used for sifting substrate. The body coloration is dark olive-green to brown overlaid with hundreds of iridescent blue-green and gold scales that create a breathtaking pearlescent sheen under strong lighting, particularly in breeding condition adults.

As an eartheater, G. brasiliensis spends considerable time sifting through the substrate in search of food, taking mouthfuls of sand or gravel and expelling it through the gill rakers. This behavior is natural and important for the fish's wellbeing; provide a deep, fine sandy substrate to accommodate it.

Given its coastal origin and broader water parameter tolerance, the Pearl Cichlid is one of the more beginner-accessible eartheaters. It can coexist with other large peaceful cichlids and robust South American species in appropriately sized aquariums, and shows less aggression than many cichlids of comparable size outside of spawning periods.

Tank Setup A minimum 200-liter tank is needed for a single adult; pairs require at least 300 liters. Provide a deep, fine sandy substrate of at least 5 cm depth to accommodate sifting behavior. Use smooth river stones, driftwood, and sturdy plants like Anubias and Java fern for décor. Avoid small gravel that could be accidentally ingested during sifting. Good filtration is essential to manage bioload and the sand disturbed by feeding.

Water Parameters Maintain temperature 20–28°C, pH 6.0–7.5, GH 5–20, KH 2–12. G. brasiliensis is unusually adaptable and tolerates harder, more alkaline water than most Geophagus species. It also tolerates temperatures as low as 18°C, making it suitable for unheated tanks in warm climates. Perform 25–30% weekly water changes.

Feeding Omnivorous sifter; offer sinking pellets, eartheater-specific cichlid granules, and supplement with frozen bloodworms, daphnia, brine shrimp, and occasional vegetable matter. Scatter food on the substrate surface or bury it slightly to encourage natural sifting behavior. Feed once or twice daily in appropriate quantities.

Tankmates Generally peaceful outside of spawning periods. Compatible with other large South American cichlids, large peaceful tetras, robust catfish, and similarly sized eartheaters. Avoid very small fish that may be accidentally ingested during sifting, or highly aggressive cichlids that will bully them.

Breeding Mouthbrooder or open spawner depending on conditions. Pairs form strong bonds during breeding; both parents participate in fry protection. The female incubates eggs buccally in some populations. Provide a peaceful environment during breeding to maximize success.