Agassiz's Dwarf Cichlid

Geographic Origin and Biotope: Very widespread throughout the Amazon basin (Peru, Brazil, Colombia). Inhabits slow forest streams, rivulets (igarapés) and oxbow lakes, preferring clear to very dark waters, covered by a thick bed of dead leaves.

Taxonomy and Morphology: Agassiz's Dwarf Cichlid (Apistogramma agassizii). One of the most famous and variable Dwarf Cichlids in the world. The unmistakable morphology is given by the showy caudal fin of the male, in the shape of a "lance" or rounded "spade".

Social Behavior: Distinctly territorial and polygamous. In nature and in spacious aquariums, a dominant male forms a harem patrolling a vast territory, within which each female establishes her own micro-territory around a den.

Coloration and Sexual Dimorphism: Exceptional polymorphism ("Tefé", "Double Red", "Fire Red" variants). The male boasts brightly colored liveries (red, blue, yellow) and a distinct horizontal black band. Females, significantly smaller, are yellow-ocher and turn brilliant lemon yellow in the reproductive phase.

Aquarium Setup: Minimum 80 cm (32 inches) tank for a trio (1 male, 2 females). Fine sand bottom (mandatory) to allow them to "sift". Arrange many visually isolated hiding places: cut coconuts, twisted woods and piles of oak leaves.

Diet and Feeding: Benthic micro-predator. Sifts the sand retaining microinvertebrates and expelling the detritus from the gills. Feed with live brine shrimp, daphnia, microworms and bloodworms. Accepts bottom granules, but a dry-only diet extinguishes reproduction and colors.

Water Quality: Demands excellent, soft and acidic water (optimal pH 5.5-6.5). High nitrates rapidly provoke exophthalmos and infections of the sensory pores (Hole-in-the-head). Use filtering peat to recreate forest tannins.

Compatibility and Tankmates: Excellent in a quiet Amazonian biotope with schooling Tetras (Nannostomus, Cardinals) acting as "dither fish" (reassuring fish). Coexistence with aggressive feeding Corydoras or other dwarf Cichlids in tanks under 120 cm (48 inches) is not recommended.

Aquarium Reproduction: Cave spawners. The lemon-yellow female chooses a cave, lays on the ceiling and chases away even the male with extreme ferocity. Cares for the eggs (hatching in 3-4 days) and guides the cloud of fry, defending them for weeks.

Risks and Diseases: Unbridled commercial crossbreeding has weakened the species: Asian hyper-colored variants ("Double Red") are very fragile, subject to tuberculosis and lethal dropsy if the temperature drops below 24°C (75°F) or water changes are lacking.