Max Size: 6cm

Yellow Tailed Congo Tetra (Alestopetersius caudalis)

Yellow Tailed Congo Tetras are peaceful, lively and somewhat skittish. However, these Tetras make an ideal resident of the well-researched, larger community aquarium. Yellow Tailed Congo Tetras are shoaling species; therefore, it would be best to maintain them in a group of at least six individuals. Keeping these fish in more significant numbers will reward you with a more natural-looking display.

A Yellow Tailed Congo Tetra's ideal aquarium mates would be Cichlids, Barbs, Danios, Gouramis, Catfish and Loaches, as they are timid and do not do well with larger and boisterous fish. It is, however, recommended that you avoid these fish if you have slow-moving long-finned fish such as Angelfish or Fancy Guppies. In addition, due to their relatively long finnage, you shouldn't keep these Tetras with known fin nippers such as Tiger Barbs.

Yellow Tailed Congo Tetras are unfussy regarding decor in the aquarium. However, this species will do well in a planted aquarium with a water flow resembling a flowing stream or river. Ideally, the substrate should consist of sand or fine gravel with added rocks or smooth pebbles, as well as some driftwood branches or roots making sure you leave plenty of swimming space for your fish. These Tetras are sensitive to raised nitrate levels; therefore, frequent water changes are essential.

Yellow Tailed Congo Tetras have pale bodies that exhibit iridescence under the right lighting conditions. Their dorsal area can present blue reflections while the sides of their bodies reflect light with shades of yellow and silver. Their caudal fin is elongated and a stunning yellow, hence their common name. All other fins are transparent with luminescent blueish-white edging. The anal and dorsal fins on these fish are long and flowing.


Yellow Tailed Congo Tetra
Yellow Tailed Congo Tetra
Yellow Tailed Congo Tetra
Yellow Tailed Congo Tetra
Yellow Tailed Congo Tetra
Yellow Tailed Congo Tetra
Quick Facts
Scientific NameAlestopetersius caudalis
Year Described1899
Other NamesYellowfin Congo Tetra, Yellowtail Tetra, Yellow Fin Tetra, Yellow Congo Tetra
OriginsDemocratic Republic of the Congo
Aquarium LevelBottom - Middle
DifficultyBeginner - Intermediate
Best kept asGroups 6+
Lifespan3 - 5 years
Water Parameters
Water TypeFreshwater
PH6.5 - 8.0
GH10 - 20
TDS36 - 268
72 - 79℉
22.2 - 26.1℃


In the home aquarium, the Yellow Tailed Congo Tetra will readily accept most good quality dried foods such as granules, flakes and sinking pellets. These modern food products have been developed to provide all adequate nutrition to maintain your fish's health and dietary requirements.

Providing additional foodstuffs such as live, frozen, and freeze-dried meals such as bloodworm, daphnia, and tubifex once or twice a week will provide additional benefits to your fish's health and well-being but is not a must for this fish.

It should be noted that bloodworms should only be given as an occasional treat and should not be used as the staple diet as they are difficult for fish to digest and can potentially cause blockages.

This fish is an omnivore in the wild, meaning it will consume some vegetable matter. Although most modern fish foods take this into account and include them in their products, you can still supplement your fish's diet with blanched vegetables such as spinach, broccoli, and zucchini. Ensure you do not overfeed your fish and remove any leftovers the following day.

Sexual Dimorphism

It is easy to distinguish between the male and female Yellow Tailed Congo Tetra. Males have brighter colourings and more elaborate finnage, and when they are ready to breed, the male colour becomes more intense. In contrast, females are rounder bodied, and when gravid, their lower abdomen will become more distended than the male. In addition, females are much plainer than males.

Other Tetras of interest

Adonis Tetra(Lepidarchus adonis)
African Moon Tetra(Bathyaethiops caudomaculatus)
African Red Eyed Tetra(Arnoldichthys spilopterus)
Arowana Tetra(Gnathocharax steindachneri)
Black Darter Tetra(Poecilocharax weitzmani)
Black Line Tetra(Hyphessobrycon scholzei)
View all Tetras
Date Added: 08/11/2021 12:02:30 - Updated: 19/10/2022 14:20:24