Zebra Acara (Ivanacara adoketa)

Geographic Origin and Biotope: Micro-endemism of the Rio Uaupès system, upper tributary of the Rio Negro in Brazil. Lives in flooded jungle environments and slow streams with soil heavily carpeted by a thick litter of rotting leaves, drowned roots and coffee-colored waters from humic acids.

Taxonomy and Morphology: Originally described as Nannacara adoketa, it was later reclassified. Stocky and compact body like a small aquatic bulldog, with a massive snout. Males exceed 8-10 cm (3-4 inches), a truly robust 'dwarf'.

Social Behavior: Formidable character for a small cichlid. They are fiercely and tenaciously territorial. They stealthily hunt among the muddy substrate and explore the aquarium. Extremely bellicose with specimens of the same species if they have not formed a fixed pair (they can kill each other).

Coloration and Sexual Dimorphism: Spectacular and unmistakable. Zebra body: very dark or black vertical bands deeply engraved on a background that varies from pale pink to bright burgundy to iridescent ice blue. The contrast is hypnotic. Breeding females become intensely dark checkerboard; the male has bright blue streaks on the snout and dorsal fins edged in scarlet red and elongated cobalt.

Tank Setup: Essential horizontally developed tank (minimum 80x40 cm / 30x16 inches base). Mandatory Blackwater biotope: fine mud-colored sand bottom generously covered with oak or Catappa leaves (litter simulation) to be replenished as they rot. Use alder cones and intricate roots. Light must be dim (amber).

Feeding and Diet: Strict micro-predators. They feed on benthic invertebrates. Extremely reluctant to classic dry feeds. They demand daphnia, enchytraeids (fresh live worms), highest quality frozen bloodworms and mysis. Rapid starvation if poorly fed.

Water Quality: ACHILLES HEEL OF THE SPECIES. Fish for experts. The water must be VERY PURE, zero nitrates, almost completely demineralized (TDS under 80 ppm, GH 0-3) and markedly acidic. A pH of 4.5-5.5 is indispensable both for their health and to block bacterial development to which they are not accustomed in nature. Scorching temperatures (26-29°C / 79-84°F).

Compatibility and Cohabitation: Difficult to match. Ideal model is a specific aquarium for a single formed pair (Species tank). Compatible, in tanks over 120 cm (48 inches), with schools of small Nannostomus (pencilfish) on the surface and some acid-tolerant loricariids. They do not tolerate competition on the bottom from Corydoras, and would kill other dwarf cichlids.

Aquarium Reproduction: Difficult but fascinating species. They lay in dark and semi-closed cavities (coconuts) in water with very high acidity (pH ~4.5). Very strict and heroic biparental care. Parents stroll with the micro-fry grazing among the decomposed leaves. The greatest danger is pH fluctuations.

Risks and Diseases: Lethal bacterial infection (ulcerations and explosive fin-rot) as soon as nitrates rise or pH exceeds 6.5. Very expensive fish intolerant to carelessness of water chemistry.