Yellow-tailed Congo tetra
Alestopetersius caudalis
Care at a glance
- Temperature
- 72–79°F (22–26°C)
- pH
- 6.0–7.5
- Adult size
- 2.4 in (6 cm)
- Minimum tank
- 20 gal (75 L)
- Temperament
- Mostly peaceful
- Social behavior
- Schooling
- Swim level
- Middle
- Difficulty
- Medium
- Breeding
- Hard
- Rarity
- Rare
- Origin
- Congo Basin
- Family
- Alestidae
Overview
Keep it in a school of at least six. In smaller numbers it gets nervous and washed out. It swims in the middle and upper water and is peaceful with similar-sized fish. In the wild it eats small insects, larvae, and bits of plant matter, so feed good flake or small pellets with regular live or frozen treats like bloodworms and daphnia.
In the wild
This tetra comes from the slow, soft, slightly acidic waters of the Congo Basin, usually over sand or mud with plenty of plants around. Aim for soft water on the acidic to neutral side, pH 6 to 7.5, and a temperature in the low to mid 20s C. A planted tank with some open swimming room and dimmer lighting shows off its colors and keeps it settled.
Good to know
It is a member of the African tetra family, Alestidae, and stays small at around 6 cm. It is an egg scatterer with no parental care, and the eggs hatch in roughly a day and a half. The IUCN lists it as Least Concern with stable wild populations.
Did you know
Males grow long, trailing extensions on the middle of the tail fin, which they flick and display during courtship to compete for females.
Where to buy
Some links may not be the exact species or variety.
- Imperial Tropicals Freshwater fish and inverts bred at a Florida hatchery
- Dan's Fish Freshwater fish, shrimp and snails with a live arrival guarantee
- The Wet Spot Tropical Fish Large freshwater selection from a longtime Portland fish store
…or ask your local fish store.
Appears in
Keeping Yellow-tailed Congo tetra?
Track water tests, reminders and stocking fit.
Related species

Sharptooth tetra
Micralestes acutidens3.5 in (9 cm)32 gal (120 L)72–79°F (22–26°C)
Long-fin tetra
Brycinus longipinnis4.9 in (12.5 cm)50 gal (190 L)72–79°F (22–26°C)
Congo tetra
Phenacogrammus interruptus3.1 in (8 cm)24 gal (90 L)73–82°F (23–28°C)African Moon Tetra
Bathyaethiops caudomaculatus3.1 in (8 cm)22 gal (85 L)72–77°F (22–25°C)
Spot-tail Tetra
Brycinus imberi7.9 in (20 cm)65 gal (245 L)72–81°F (22–27°C)
Niger tetra
Arnoldichthys spilopterus3.9 in (10 cm)50 gal (190 L)75–81°F (24–27°C)
