Blue Diamond Tetra - Alestopetersius smykalai Fish Profile & Care Guide
Introduction
The Blue Diamond Tetra is a captivating freshwater species endemic to Nigeria's Lower Niger River Basin. Reaching up to 6 cm in length, this species is renowned for its shimmering blue hues, particularly in males. In summary, Blue Diamond Tetras are a visually striking and peaceful species that can be a delightful addition to a West African-themed aquarium when provided with appropriate conditions and companions. Their schooling nature and compatibility with similarly tempered species make them ideal for community tanks, while their breeding behaviour offers an engaging challenge for aquarists interested in fish propagation.
The Blue Diamond Tetra is a calm, shoaling species best kept in groups of six or more to encourage natural behaviour and minimise stress. When housed in the right conditions, they generally ignore other tank inhabitants, focusing instead on their kind. This makes them excellent companions for West African cichlids in a regional biotope or peaceful species too large to be considered prey. Ideal tankmates include other medium-sized characins, gentle catfish, and similarly non-aggressive species that thrive in comparable water conditions.
For aquarists aiming to replicate their natural habitat, a well-planted aquarium with subdued lighting and open swimming areas is ideal for Blue Diamond Tetras. Floating plants can help diffuse light, creating a comfortable environment. An aquarium of at least 120 litres is recommended to accommodate their active swimming behaviour. Regular water changes are essential, as this species is sensitive to elevated nitrate levels.
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Sexual Dimorphism
Sexual dimorphism in Blue Diamond Tetras is pronounced and reliable for distinguishing between males and females. Adult males are notably more colourful, exhibiting vibrant blue hues along their dorsal surfaces, contributing to their common name. In contrast, females display a more subdued colouration. Morphologically, males are larger and develop significantly elongated dorsal, ventral, anal, and caudal fins, often adorned with white edging, enhancing their visual appeal. Females, conversely, possess shorter, more rounded fins.
Quick Facts
| Scientific Name | Alestopetersius smykalai |
|---|---|
| Year Described | 1967 |
| Other Names | Blue Congo Tetra, Blue Diamond Characin |
| Kingdom | Animalia |
| Classification | Actinopterygii |
| Order | Characiformes |
| Family | Alestidae |
| Genus | Alestopetersius |
| Origins | Nigeria |
| Approx Max Size | 6 cm |
| Temperament | Peaceful |
| Aquarium Level | Middle - Top |
| Difficulty | Intermediate |
| Shoaling | Yes |
| Best kept as | Groups 6+ |
| Diet & Feeding | Omnivore |
| Reproduction | Egg-Scatterer |
| Average Lifespan | Up to 5 Years |
Water Parameters
| Water Type | Freshwater |
|---|---|
| pH | 6.0 - 7.5 |
| GH | 8 - 15 |
| ℉ | 73 - 81 |
|---|---|
| ℃ | 23 - 27 |
Natural Habitat
The Blue Diamond Tetra is a freshwater species endemic to Nigeria's Lower Niger River Basin. Specifically, it inhabits the Imo and Niger River drainages, making it unique among its genus, as other Alestopetersius species are typically found in the Congo River system. This species thrives in tropical freshwater environments characterised by soft to moderately hard water. These Tetras inhabit clear, slow-moving streams and rivers with ample vegetation, providing shelter and feeding opportunities. Due to their limited distribution and ongoing threats from habitat degradation, pollution, and the introduction of non-native species, A. smykalai is currently classified as Endangered on the IUCN Red List.
Breeding
The breeding habits of Blue Diamond Tetras are not extensively documented, but available information provides insights into their reproductive behaviour. This species is an open-water egg scatterer, exhibiting no parental care. In captivity, successful breeding has been achieved by maintaining a separate spawning aquarium with soft, acidic water, subdued lighting, and the inclusion of spawning mops or fine-leaved plants like Java moss to facilitate egg deposition.
You can induce spawning by gradually raising the water temperature. Females may scatter several hundred clear, non-adhesive eggs among the spawning medium or substrate. To prevent predation, it is crucial to remove the adult fish immediately after spawning. The eggs typically hatch within 5 to 6 days, and the fry become free-swimming after an additional 4 or 5 days.
Raising the fry requires careful attention, as they are initially translucent and light-sensitive. You should feed them infusoria or other microscopic foods until they are large enough to consume Artemia nauplii or microworms. Growth is relatively slow, with juveniles taking several months to reach maturity. Due to their sensitivity and specific requirements, breeding these Tetras is moderately challenging and best undertaken by experienced aquarists.
Diet & Feeding
The Blue Diamond Tetra exhibits omnivorous feeding habits with a notable preference for animal-based foods. In their natural habitat, these Tetras consume a variety of small invertebrates, including insect larvae, micro-crustaceans, and worms. During periods when such prey is scarce, they adapt by feeding on detritus, algae, and biofilm, demonstrating dietary flexibility.
Blue Diamond Tetras thrive in captivity on a varied diet that mirrors their natural feeding patterns. They readily accept high-quality flake and pellet foods, but you should supplement their diet with frozen or live foods such as bloodworms, brine shrimp, and daphnia for optimal health and colouration. Incorporating vegetable matter, like spirulina flakes, can also be beneficial.
Feeding should be conducted in small portions multiple times daily, ensuring the fish consume all the food within a few minutes to prevent overfeeding and maintain water quality. This feeding regimen supports their active nature and contributes to their overall well-being.
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Published: 27 May 2025
Last Updated: 27 May 2025