Oliotius oligolepis
Also known as: Checkered Barb, Checker Barb, Island Barb
Origin: Southeast Asia (Sumatra)
The Checkered Barb is a charming small barb from Sumatra whose distinctive scale pattern — each iridescent golden scale edged in black — produces the checkered effect from which it takes its name. The overall body coloration is warm golden-green with the black scale margins creating a net-like pattern along the flanks. Males become particularly attractive as they mature: the fins flush with vivid orange-red color, most prominently in the dorsal and caudal fins, providing a striking contrast to the golden body. Females are slightly larger and less colorful, with a more rounded belly. Growing to just 5 cm, this species is suitable for medium-sized community aquariums and is notably more peaceful than many of its barb relatives, with a much lower tendency to fin-nip. Native to the blackwater peat swamps and slow-moving, tannin-stained streams of Sumatra, it tolerates and prefers somewhat acidic, soft conditions, though it is reasonably adaptable in captivity. It is a schooling, mid-water species that is active and confident when kept in appropriate groups. A planted aquarium with warm tones suits it particularly well.
Tank Setup A 60-liter aquarium with dark substrate, soft lighting, and generous plant coverage is appropriate. The Checkered Barb looks stunning against green plants, with its golden-black patterning and orange fins providing a vivid contrast. Moderate current and good filtration are appreciated.
Water Parameters pH 6.0–7.0, temperature 20–26°C, general hardness 2–12 dGH. Soft to moderately hard, slightly acidic to neutral water is preferred. Peat filtration or tannin additions improve condition and color.
Feeding An omnivore that accepts quality flakes, small pellets, and frozen or live foods. Supplement with blanched vegetables. Feed twice daily in small portions.
Tankmates One of the more peaceful barb species. Compatible with tetras, rasboras, corydoras, small loaches, and even some long-finned species. Avoid keeping with very aggressive fish.
Schooling Keep a minimum of six. Larger groups of eight or more produce the best natural behavior and display.
Health and Maintenance Hardy and relatively easy to maintain. Regular weekly water changes of 25%. Monitor for ich, which can occur during temperature drops.
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