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. In addition, The interaction between rival males is also fascinating to watch as they will reveal their best colours when fighting for female attention or hierarchical rank within the group.

Ideal tankmates for Yellow Tailed Congo Tetras could include medium to large-sized Tetras, Cichlids, Barbs, Danios, Gouramis, Catfish and Loaches, avoiding much larger and more boisterous fish due to their timid nature. However, these fish might nip at slow-moving long-finned fish such as angelfish or fancy guppies; therefore, it is recommended that you avoid these fish. Also, as these Tetras have relatively long finnage, they should not be kept with known fin nippers such as Tiger Barbs.

Yellow Tailed Congo Tetras are unfussy when it comes to 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 very 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 correct 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 colour 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.

Quick Facts
Scientific NameAlestopetersius caudalis
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℃

Photos of the Yellow Tailed Congo Tetra

Yellow Tailed Congo Tetra
Yellow Tailed Congo Tetra
Yellow Tailed Congo Tetra
Yellow Tailed Congo Tetra
Yellow Tailed Congo Tetra
Yellow Tailed Congo Tetra

Natural Habitat

Yellow Tailed Congo Tetras are native to the Boma and the Lower Congo River in the Democratic Republic of Congo in Africa. These Tetras inhabit murky streams, tributaries, pools, and marshes with slightly acidic water. The Congo tetra usually gathers in areas with tall vegetation and few trees from the forest canopy above. The substrate in their habitat is made up of sand, silt, and mud.

What to feed the Yellow Tailed Congo Tetra

Yellow Tailed Congo Tetra are omnivorous in the wild, feeding on crustaceans, small invertebrates and algae. However, in the home aquarium, these Tetras will survive on a diet of good quality dried foods like pellets, flakes and granules. Still, like most fish, they fare better when offered a varied menu also containing live, frozen and freeze-dried food such as Mysis Shrimp, mosquito larvae, daphnia, bloodworm, Moina and brine shrimp as this will help your fish to develop brighter colouring.

How to sex the Yellow Tailed Congo Tetra

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.

How to breed the Yellow Tailed Congo Tetra

Yellow Tailed Congo Tetras do not regularly appear to be bred in the aquarium hobby since few details are available. However, they are egg-scattering spawners that exhibit no parental care.

If you plan to breed Yellow Tailed Congo Tetras, then it is recommended that you have a separate breeding tank prepared. This tank can be empty, but you may wish to include a mesh or grid on the bottom to catch the fertilised eggs. A layer of marbles will also suffice. These fish will require aquatic plants such as java moss to scatter their eggs in; spawning mops will also work just as well.

Yellow Tailed Congo Tetras will breed in a community aquarium and, if the aquarium is well planted, it is possible that some fry may survive to reach adulthood.

The female will swim actively around the tank and, if you add two males, they will encourage her to lay her eggs by bumping into her; however, just a male and a female are advised. The female will then lay her eggs which the males will fertilise straight away, and they will drop down to the bottom of the tank.

Spawning typically takes place in the early morning and is triggered by the sunrise. Once spawning is complete, you should remove the adults, as they will probably consume the eggs if given a chance. A mature female may lay anything up to 300 eggs.

It is recommended that you keep the lights off and the tank dark because Tetra eggs and fry are susceptible to the light.

The eggs will usually hatch in around thirty-six hours depending on the temperature in the tank, and the water conditions, then the fry will become free-swimming around four to five days after that. It would be better to keep the tank unlit for the first week or so, then gradually increase the lighting.

The newly hatched fry will feed first on their yolk sac but, once free-swimming, they can be fed infusoria and rotifers. After hatching, the fry seems quite vigorous; however, the fry will go into a dormant phase before they become free-swimming, so make sure you don’t mistake this initial stage.

After about four days, you can then add baby brine shrimp and microworm. Once the fry is sufficient in size and is not mistaken as a snack, you can then introduce them into the community aquarium, where they will accompany the existing shoal.

Other Tetras of interest

African Moon Tetra(Bathyaethiops caudomaculatus)
African Red Eyed Tetra(Arnoldichthys spilopterus)
Black Darter Tetra(Poecilocharax weitzmani)
Black Line Tetra(Hyphessobrycon scholzei)
Black Neon Tetra(Hyphessobrycon herbertaxelrodi)
Black Phantom Tetra(Hyphessobrycon megalopterus)
View all Tetras
Date Added: 08/11/2021 12:02:30 - Updated: 02/12/2021 17:52:22