Red Sumatran betta

Geographic Origin and Biotope: Endemic to northwestern Sumatra (Indonesia), typical of the areas surrounding Lake Toba. Lives in isolated forest pools and swampy rivers surrounded by humid forests, with muddy bottoms densely covered with decaying plant remains.

Taxonomy and Morphology: Toba Betta (Betta rubra). Believed extinct for almost a century and then rediscovered. Stocky and colorful body, with a massive head adapted for oral incubation. Has short rounded fins and no sail-like dorsal fin.

Social Behavior: Fairly shy, but within the group (to be kept in single-species schools) intricate hierarchies are created. Males can persistently peck at each other for territory and mating but rarely inflict serious damage.

Coloration and Sexual Dimorphism: Exceptional bright fiery red or carmine livery with vertical black "blocks" in dominant males. A characteristic black stripe borders the head. Females are noticeably duller (gray or pinkish) with dark horizontal stripes.

Aquarium Setup: Dedicated 60 cm (24 inches) tank (for a harem or group). Natural "Blackwater" layout with dense plant cover and a soft carpet of Ketapang leaves. Lighting must be dim and water flow practically absent (slow at the surface).

Diet and Feeding: Omnivore with marked protein/insectivorous needs. Compared to other "wilds" it easily adapts to granular foods, but the red of the livery disappears if not regularly supplemented with Drosophila, live Daphnia and red bloodworms.

Water Quality: Suffers immensely from high nitrates. The ideal water is soft (RO mixed or filtered on peat) with a markedly acidic pH (5-6.5). Keep the lid tightly closed to avoid thermal shocks to the labyrinth.

Compatibility and Tankmates: Perfect in a "Species only" tank. If obligated, cohabits with small Southeast Asian loaches or microscopic rasboras. Inserting more lively fish will induce the Betta rubra to literally disappear from sight, remaining holed up and terrified.

Aquarium Reproduction: Mouthbrooder. During courtship, the male's red becomes dazzling. Incubation lasts about 12-14 days; a stressed male in this phase risks swallowing the eggs. It is better to place the male in a separate nursery.

Risks and Diseases: Fish tuberculosis (Mycobacteriosis) in case of a drop in water quality. It is a demanding fish and subject to fin rot caused by bacterial infections if kept in waters that are too hard (alkaline).