Maximum size : 6 cm

Infernal Tetra - Hemigrammus-Hyphessobrycon "Infernalis" : Complete Fish Profile & Care Guide

Table of contents


Infernal Tetras (Hemigrammus/Hyphessobrycon "Infernalis") are generally characterized by their relatively peaceful nature, but it is essential to note that they can exhibit slight territorial tendencies. As a consequence of their active and, at times, territorial behaviours, it is advisable to avoid housing small, delicate, or slow-moving fish with them. Instead, opting for slightly larger and more robust tankmates, such as Emperor Tetras, Lemon Tetras, Serape Tetras, and larger Barbs, would be conducive to a harmonious cohabitation. To ensure a favourable social dynamic, it is recommended to maintain Infernal Tetras in groups of five or six individuals.

An aesthetically pleasing aquarium for these Tetras would ideally feature abundant vegetation, creating both dense areas of greenery and open spaces for swimming. The addition of driftwood or bogwood to the setup would further enhance the fish's well-being. It is imperative to utilize a tightly fitting lid for the aquarium, as Infernal Tetras have been known to exhibit a propensity for jumping out of the tank.

Male Infernal Tetras showcase a remarkable dark red body colour, although this striking hue is predominantly evident in the most dominant individuals. Typically, only a select few have the opportunity to exhibit such impressive body colouration. Additionally, males are distinguished by a thick, dark lateral line on the back half of their bodies. In contrast, females display a beige to light yellow body colouration with a subtle red hue on their abdomens. The fins of these fish are primarily transparent, albeit displaying subtle tinges of colour.

Infernal Tetra Photos

Sexual Dimorphism

Distinguishing between male and female Infernal Tetras is a straightforward process. Males exhibit significantly more vibrant colouring, particularly when they engage in a display known as "flaring," during which they become almost entirely red. In contrast, females possess a comparatively more subdued and less striking appearance.

Quick Facts

Scientific NameHemigrammus-Hyphessobrycon "Infernalis"
Max Size6 cm
Aquarium LevelMiddle - Top
Best kept asGroups 5+
Diet & FeedingOmnivore
LifespanUp to 5 Years

Water Parameters

Water TypeFreshwater
pH 5.5 - 7.5
GH 5 - 15
TDS 18 - 179
Ideal Temperature
72 - 82
22 - 27

Natural Habitat

Regrettably, a scarcity of comprehensive information exists regarding the habitat of the Inferno Tetras. Nonetheless, these Tetras are known to inhabit the waters along the eastern slope of the Serra do Cachimbo, situated in the southern region of the state of Pará, Brazil, within the continent of South America.


Regrettably, there is a lack of documented breeding reports or available information on the specific breeding methods and practices for Infernal Tetras

Diet & feeding

In a home aquarium setting, Infernal Tetras readily accept a wide range of high-quality dried foods, including granules, flakes, and sinking pellets. These modern food formulations have been meticulously developed to fulfil all essential nutritional requirements, effectively supporting the overall health and dietary needs of the fish.

To further enhance the well-being of the fish, supplementary food items such as live, frozen, and freeze-dried options, such as mini bloodworms, daphnia, and tubifex, may be provided once or twice a week. While not obligatory, these additional foodstuffs contribute to the fish's vitality and offer supplementary health benefits.

In their natural habitat, Infernal Tetras exhibit an omnivorous diet, incorporating certain vegetable matter into their feeding habits. Notably, contemporary fish foods generally consider this aspect and include suitable plant-based components. Nonetheless, it remains beneficial to complement the fish's diet by supplementing it with blanched vegetables, such as spinach, broccoli, and zucchini, which contribute to their nutritional intake.

Maintaining a balanced feeding regimen is of paramount importance to prevent overfeeding. Any uneaten food should be promptly removed the following day to uphold water quality and mitigate potential health issues associated with food decomposition.

Other Tetras of interest