Torpedo Dwarf Cichlid (Taeniacara candidi)

Geographic Origin and Biotope: Fascinating inhabitant of the central Amazon basin, particularly the Rio Negro and Rio Tapajós system. Takes refuge in the shallows of flooded forests and in the slow streams (igarapés) of deeply amber blackwaters. Stations camouflaged among huge banks of dry leaves on the sandy bottom.

Taxonomy and Morphology: Only member of its genus (monotypic species). A 'micro' cichlid, which pushes adaptation to the extreme: does not exceed 5 cm (2 inches). Its shape is exceptionally tubular, filiform and slender, looking like a pencil or a dart, evolved to slip quickly through the dense leaf debris of the Amazonian bottom without getting entangled.

Social Behavior: Stealthy territorial micro-hunter. Extremely bellicose with males of its own species. Spends days gliding one millimeter from the bottom, visually inspecting the leaf litter and darting to catch tiny organisms. Loves the shade, escaping to hide in dark crevices if abruptly illuminated.

Coloration and Sexual Dimorphism: Extraordinary morphological and chromatic dimorphism. The adult male boasts a powerful arrow-shaped lanceolate-acuminate caudal fin and very long thin ribbon-like ventral fins. The pearly-gray or brown body is engraved by a very clear horizontal black line from eye to tail. During courtship, the head and back of the male light up with metallic cobalt reflections. Females are minute, stocky and dull-colored, except in reproduction when the belly strongly tinges with bright yellow-orange.

Tank Setup: Demands a dwarf leaf paradise in tanks of at least 60-80 cm (24-30 inches). NO ROCKS. Bottom of very fine sand entirely covered with softened oak or Catappa leaves and twisted branches. Very dim light, filtered by large floating plants or peat extract to darken the water. Filtration must be mild, almost stagnant.

Feeding and Diet: Finicky micro-predators. They almost always refuse dry flaked or hard granular food. Their survival in the tank depends on the constant administration of live food (brine shrimp nauplii, micro-worms) and small frozen food (well-chopped bloodworms, daphnia, cyclops). Slow and shy foragers.

Water Quality: ACHILLES HEEL. Only for dedicated aquarists: they demand ultra-soft and acidic water. Carbonate hardness at zero, lethally low pH and inhospitable to bacteria (between 4.0 and 6.0). Tolerated nitrates close to zero. Stable and torrid temperatures (26-30°C / 79-86°F). Sensitive to chlorine surges or massive bottom cleanings that alter the weak bacterial chemistry in such acidic waters.

Compatibility and Cohabitation: Roommates from amber Blackwater nano-tanks. Perfect with very small Characins that swim in mid-water reassuring them (e.g., Nannostomus, Tucanoichthys, Paracheirodon simulans - Green neons). Incompatible with other territorial dwarf cichlids that would massacre the filiform Taeniacara or with agitated bottom fish or large Corydoras that would destroy its leaf habitat and steal its food in a flash.

Aquarium Reproduction: Difficult species to mate (they kill each other if the female is not ready). They lay small grains of eggs in tiny crevices or inside blind holes (rolled leaves, cane tubes). The female entrenches herself inside, closing the entrance and taking on yellow/black alarm colors, harshly defending and biting fins at her own male, driving him away from the perimeter.

Risks and Diseases: Lightning lethality from fungal infections if nitrates are not controlled. Extreme susceptibility to dropsy in case of wrong digestion or blocks due to having eaten polluted food in the sand or in water not warm enough.