Maximum size : 3.5 cm

Exclamation Mark Tetra - Bryconella pallidifrons : Complete Fish Profile & Care Guide

Table of contents


Delve into rarity and elegance with the Exclamation Mark Tetra (Bryconella pallidifrons), a petite, tranquil, and delicately beautiful shoaling fish that remains a hidden gem within the aquatic hobby. Perfectly suited for nano or well-planted aquariums, these remarkable Tetras offer an enchanting spectacle to behold.

With their diminutive size and fragility, keeping Exclamation Mark Tetras exclusively with their own kind is advisable, ensuring their safety and well-being. However, in a large community aquarium populated solely by small, peaceful species, these Tetras may thrive and contribute to the harmonious aquatic tapestry. While occasional squabbles may arise among males of the same species, rest assured no lasting harm will be inflicted.

Indigenous to the mysterious blackwater habitats, Exclamation Mark Tetras are true connoisseurs of this environment. Enhance their vitality by employing peat filtration, an invaluable technique that not only improves the chemical balance of the water but also exerts a bactericidal effect, reducing the aquarium's bacterial load. Emulating the natural ambience, consider adding dried leaves, such as Indian almond or oak, along with driftwood and alder cones to create an exquisite blackwater ambience within your own home aquarium. As the water gradually darkens, it will mirror the Tetras' native habitat, immersing you in a captivating display of authenticity.

Despite their allure, the Exclamation Mark Tetra remains mysterious, with limited information available. Picture a mesmerizing creature adorned with a silvery transparent body embellished by a striking black and gold longitudinal line that gracefully extends towards the caudal fin. Notably, this fascinating line slightly broadens at its conclusion, giving rise to a small patch that remarkably resembles an exclamation mark, which befits its distinctive name.

Exclamation Mark Tetra Photos

Sexual Dimorphism

Distinguishing between the male and female Exclamation Mark Tetra can pose a certain level of challenge. Nonetheless, subtle differentiating characteristics exist to aid in identification. For example, males tend to exhibit a slightly smaller physique with a comparatively slender body structure, while females present themselves with more prominent abdominal curvature and a larger overall size in comparison to their male counterparts.

Quick Facts

Scientific NameBryconella pallidifrons
Year Described1946
Other NamesBryconella Tetra, Thread Tetra
OriginsBrazil , Colombia
Max Size3.5 cm
Aquarium LevelMiddle - Top
Best kept asGroups 8+
Diet & FeedingOmnivore
LifespanUp to 5 Years

Water Parameters

Water TypeFreshwater
pH 6.0 - 7.5
GH 5 - 10
KH 2 - 4
Ideal Temperature
78 - 82
25 - 27

Natural Habitat

Embark on a virtual journey to the enchanting waterways of South America, where the Exclamation Mark Tetra reigns in the Yahuacaca River of Southern Colombia and Brazil. These captivating fish thrive in their natural habitat, where they gracefully navigate medium-flowing, soft, and acidic blackwater rivers and streams. Yet, the very essence of their existence lies within the captivating embrace of these crystal-clear aquatic realms, adorned with an array of pebbles, delicate leaf litter, and the intricate interplay of driftwood roots and branches. Join us in exploring the intricate tapestry of their preferred habitat, where every detail harmoniously intertwines to create an environment that perfectly complements the Exclamation Mark Tetra's remarkable beauty and nature.


Regrettably, comprehensive documentation regarding the breeding habits of Exclamation Mark Tetras is scarce or nonexistent at present.

Diet & feeding

Exclamation Mark Tetras display a versatile palate, accepting a wide range of aquarium food options. Upon their initial introduction to the aquarium, it is not uncommon for these Tetras to exhibit a degree of initial shyness towards food. To alleviate this, it is recommended to provide them with live food as an initial offering. Once acclimated and settled in their new environment, a well-rounded and balanced diet should be provided, consisting of premium-quality dried varieties such as flakes, pellets, and granules. Augmenting their diet with a diverse array of frozen and live food options, including daphnia, brine shrimp, Tubifex, and bloodworm, is highly beneficial. Furthermore, including occasional green vegetables in their dietary regimen promotes optimal colouration and overall health for these captivating fish.

Other Tetras of interest