Hyphessobrycon sp. 'Blue Devil'

Hyphessobrycon Notidanos "Yellow" — a multicolored, red-iris tetra from Brazil

Hyphessobrycon Notidanos "Yellow" stands out in any aquarium with a vividly layered color profile and a compact, agile presence. This upper-Tapajós river native from Brazil was scientifically described in 2006, making it a relatively fresh and exciting addition for serious hobbyists who want to expand their species repertoire.

What makes the Yellow variant truly unique

• Multicolored allure: described as a striking, multicolored member of the Hyphessobrycon genus, offering more visual depth than single-tone tetras.
• Red iris focal point: the Yellow variant features a bold red iris that catches light and draws the eye, creating a dramatic contrast against its body tones.
• Distinct from the Red Devil: while there is a Red Devil variant with blue iris, the Yellow Devil is defined by its red iris and its own distinctive coloration, giving collectors a unique look in a peaceful schooling setup.
• Compact and social: small, active swimmers that shine when kept in groups, adding movement and color to midwater zones of the aquarium.

Origin and natural habitat

This fish comes from the upper drainage of the Rio Tapajós in Brazil, a region known for its clear, warm waters and diverse tetra populations. Its natural habitat informs its preference for well-structured environments with subtle lighting and ample swimming space, making it an excellent centerpiece or color accent in a thoughtfully arranged community tank.

Care and husbandry ideas

In your aquarium: best practices and setup ideas

• Tank mates: ideal for peaceful, small-tetra-compatible communities. Pair with other non-aggressive species to maintain harmonious behavior and showcase its vibrant iris.
• Schooling for impact: keep in small to larger schools (6–8 or more) to reveal natural schooling behavior and maximize color expression in the group.
• Aquarium ambiance: midwater-dwelling fish benefit from a mix of open swimming space and gentle plant coverage. Subtle lighting helps the red iris really stand out against the multicolored body.
• Maintenance considerations: like other small tetras, they appreciate stable water conditions and regular, light-to-moderate maintenance to keep colors vivid and stress levels low.

Care snapshot and practical tips

Introduce in a mature, stable aquarium to reduce stress during acclimation. Showcases best when kept in groups, with attention to balanced lighting to emphasize eye-catching iris color. Monitor water quality consistently and perform regular, small water changes to maintain clarity and color.