Hyphessobrycon haraldschultzi

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Hyphessobrycon haraldschultzi, also called the Crystal Red Tetra, is a small Brazilian characid valued for its delicate shape and translucent red coloration. Suited to a peaceful community aquarium, it should be kept in a group and provided with soft, clean, well-oxygenated water. Its schooling behaviour and modest size make it an appealing choice for a planted South American-style setup. This species is less common than the most widely available captive-bred tetras, and offered specimens may be wild collected, making careful acclimation especially important.

General description

Hyphessobrycon haraldschultzi is a small freshwater fish in the family Characidae, native to Brazil. It inhabits calm or moderately flowing areas of central Brazilian river systems and generally moves in a school. In aquaria, it is appreciated for its bright appearance, constant activity and usually peaceful temperament. Keeping several individuals allows more natural behaviour and reduces nervousness. It is suitable for a community aquarium containing calm fish of similar size. Efficient filtration, regular water changes and subdued lighting help bring out its colours. As the species is fairly uncommon in the trade, wild fish should be acclimated gradually, with close attention to transport stress, water quality and feeding response.

Geographic origin and biotope

This species is associated with the rio Araguaia basin in Brazil, within the extensive Tocantins-Araguaia system. Its natural habitat includes tropical waterways with small channels, quiet margins and slow-flowing areas shaped by vegetation and woody debris. The water is generally warm, soft to moderately mineralized and well oxygenated in flowing sections. Banks may include aquatic plants, submerged roots and cover that provides shelter. In an aquarium, this setting can be recreated with plants, wood, shaded areas and gentle circulation rather than strong current. Because offered fish may be wild collected, quarantine and slow acclimation are particularly sensible.

Precise locality and local name

The most useful geographic reference for Hyphessobrycon haraldschultzi is the rio Araguaia and its basin in central Brazil. This places the species in a region distinct from the large Amazonian areas often associated with aquarium tetras. The trade name Crystal Red Tetra refers to its red colour and partly translucent body. It should not be confused with a Crystal Red shrimp, which belongs to an entirely different zoological group. In aquarium communities, the scientific name remains the most precise way to identify it. Its Brazilian vernacular name is not standardized; in the aquarium hobby, Crystal Red Tetra is the most practical name for distinguishing it.

Appearance and physical characteristics

Hyphessobrycon haraldschultzi has a short, slender and laterally compressed body, typical of many small characids. Its colour pattern combines a silvery to translucent base with red coloration on the body and fins. Intensity varies with age, sex, health, diet and surroundings. The delicate fins and body appear more vivid under moderate lighting, especially over a dark substrate and among plants. As with many tetras, colour may fade after transport or under stress. A well-structured aquarium helps reveal both its contrasts and schooling behaviour. Its adult size remains modest, making it suitable for reasonably sized community aquariums when adequate swimming length and stable water are provided.

General diet

Omnivorous with a micro-predatory tendency, Hyphessobrycon haraldschultzi accepts a varied diet made up of tiny prey and foods formulated for tetras. It can be offered fine pellets, quality flakes crushed into small pieces, and small frozen or live foods. Baby brine shrimp, cyclops and daphnia are useful choices for encouraging feeding and supporting colour. Feeding small portions once or twice daily reduces waste and pollution. Wild fish may need several days to adjust before accepting dry foods; starting with frozen or live food can make the transition easier. A varied, moderate diet supports good condition and helps maintain stronger red coloration.

Essential data

• Native river: rio Araguaia
• Local name used: Crystal Red Tetra
• Origin of the scientific name: Hyphessobrycon is the genus name; haraldschultzi honours Harald Schultz.
• Etymology of the full name: Hyphessobrycon combines Greek roots associated with small size and fish form; haraldschultzi is a patronymic name formed from Harald Schultz.
• Common/vernacular names: Crystal Red Tetra
• Family: Characidae
• Subfamily: Characinae
• Name pronunciation: if-ess-oh-BRY-kon - har-ald-SHOOLT-see
• Discovery: scientifically described by Lauro Pereira Travassos in 1960
• Maximum adult size: about 4 cm
• Water temperature and pH: 24 to 28 °C; pH 6.0 to 7.2
• Waterway appearance and surrounding vegetation: tropical waters with gentle to moderate flow, roots, submerged wood and riparian vegetation
• Typical tankmates: peaceful small tetras, small corydoras, small loricariids, pencilfish, peaceful adult shrimp and calm dwarf cichlids
• Temperament and behaviour: peaceful, schooling and active; keep in a group
• Water depth: shallow to intermediate areas
• Sexual dimorphism: females are generally rounder and fuller-bodied; males are often slimmer
• Bottom configuration and flow: sand or fine substrate, plant debris and wood; low to moderate flow

In your aquarium

To succeed with Hyphessobrycon haraldschultzi, provide a stable group, warm soft water and a layout with shaded areas. Wild specimens benefit from quarantine, gradual acclimation and appealing food at first. Mature filtration, regular water changes and the absence of aggressive tankmates are essential. Since this is a moderately uncommon species, each fish benefits from consistent conditions and minimal handling. A planted, well-oxygenated and peaceful aquarium will make its schooling behaviour easier to observe and help preserve its translucent red colours.