Scarlet Betta Care Guide - Habitat, Diet & Breeding

Betta coccina, commonly known as the Scarlet Betta, is a tiny wild betta with a vivid red to wine-coloured body. The flanks may show darker edging and subtle iridescent blue or green marks, while the fins are often red with contrasting dark margins. Colour intensity varies with mood, age and condition.

Unlike the familiar Siamese fighting fish, Scarlet Bettas are delicate, retiring fish rather than flamboyant long-finned display animals. They spend much of their time hovering among plants, leaf litter and shaded roots, but males can become strongly territorial when displaying to one another.

In nature, this species inhabits shaded peat swamps and blackwater pools beneath tropical forest. The water is stained brown by decomposing leaves and wood, and the surrounding cover gives these small fish places to retreat from predators and from rivals.

Scarlet Bettas are members of the Betta genus and possess a labyrinth organ, allowing them to breathe atmospheric air. Their specialised habitat and often limited natural range make responsibly sourced, captive-bred specimens especially valuable to aquarists interested in wild bettas and blackwater ecosystems.

Betta coccina comes from the blackwater peat-swamp forests of the Malay Peninsula and Sumatra, particularly southern Peninsular Malaysia and parts of Indonesia. Its habitat is associated with tannin-stained, very soft water, dense marginal vegetation and shallow forest pools or sluggish streams.

A single Scarlet Betta can be kept in an established aquarium of at least 20 litres, with a footprint around 45 by 30 cm; a pair or small group benefits from 30 litres or more and extra floor space. Use gentle filtration, a secure lid and subdued lighting. Dark sand or fine rounded substrate, driftwood, dried leaves, dense plants, floating cover and small caves recreate the shaded forest-floor habitat while providing essential refuges and territorial boundaries.

Scarlet Bettas reach a maximum adult length of about 4 cm (1.6 in). Males are usually slightly larger and more slender-bodied than females, although individual size varies.

Scarlet Bettas are carnivorous micropredators that naturally feed on small aquatic invertebrates, insect larvae and other tiny prey. Offer a varied diet of appropriately sized frozen or live foods such as daphnia, mosquito larvae, brine shrimp and blackworms, supplemented with a high-quality small betta or micro-pellet. Small portions are preferable because their mouths and stomachs are tiny.

Scarlet Bettas are best kept in a species-focused aquarium or with very peaceful, small tankmates such as chili rasboras, celestial pearl danios, pygmy Corydoras and other unobtrusive blackwater fish. Avoid fin-nipping species, boisterous community fish and larger predators. Adult males may fight in cramped quarters, so multiple males need a heavily structured aquarium with ample visual barriers or should be housed separately.

Scarlet Bettas are bubble-nesting fish that can be bred in a quiet, covered aquarium with very soft, acidic water and gentle filtration. The male usually constructs a nest beneath a floating leaf or other surface shelter, embraces the female to collect the eggs, and then tends the nest while the female is removed. The eggs generally hatch after around 24 to 48 hours, and the free-swimming fry need tiny first foods such as infusoria before progressing to baby brine shrimp.

Males are generally slimmer, more intensely coloured and may develop longer, more pointed fins, particularly when displaying. Females are usually shorter-bodied and fuller through the abdomen, with less extended fins and a more subdued pattern.