Congo Tetra
Phenacogrammus interruptus
Also sold as Congos
Synonyms Micralestes interruptus
Congo Tetra (Phenacogrammus interruptus) is a peaceful freshwater fish that reaches about 8 cm (3.1 in) and swims in open water in a shoal. It wants 73–82°F (23–28°C) and pH 6–7.5, is kept in groups of 6 or more, and needs a tank of at least 108 L (29 gal).
Check a freshwater stocking selection with your tank size and animal counts.
Try it in a tank
Put Congo Tetra in a 3D tank at your size and see how it sits with everything else. Free with an account.
At a glance
| Type | Fish |
|---|---|
| Adult size | 8 cm (3.1 in) |
| Minimum tank | 108 L (29 gal) |
| Group size | 6 or more |
| Temperature | 73–82°F (23–28°C) |
| pH | 6–7.5 |
| Temperament | Peaceful |
| Lifespan | 3–5 years |
| Eats shrimp | Yes |
Before it goes in
- Congo Tetra needs at least 108 L (29 gal). The smallest size in this library that clears that is the 29 Gallon.
- Keep 6 or more. Below that it hides, colours down and is far more likely to be picked on.
- It eats shrimp. Cherry Shrimp, Crystal Red Shrimp and Bamboo Shrimp are on the menu.
- It holds at 73–82°F (23–28°C). That shares a window with Betta and Cherry Shrimp.
- A group of 6 takes up roughly 72% of what a 29 Gallon will comfortably hold, so plan the rest of the stock around it.
Congo Tetra: care and setup
What tank size does it need?
At least 108 L (29 gal). The smallest size here that clears it is the 29 Gallon.
How many should I keep?
6 or more. Fewer than that and it spends its time hiding instead of out in the open.
Will it eat shrimp?
Yes. Shrimp are food to it, so pick one or the other.
What water does it want?
73–82°F (23–28°C), pH 6–7.5.
How long does it live?
3–5 years in a tank that suits it. That is how long you are signing up for.
Good tank mates
- Tank mates from this library that share its temperature window, are peaceful and eat neither it nor its young: Goldfish, Bristlenose Pleco, Celestial Pearl Danio, Molly and Otocinclus.
- Plants that hold up with it: Hygrophila corymbosa 'Siamensis', Water Sprite, Anubias nana 'Petite' and Cryptocoryne wendtii.
Often compared with
| Congo Tetra | Black Skirt Tetra | Bleeding Heart Tetra | |
|---|---|---|---|
| Adult size | 8 cm | 6 cm | 6 cm |
| Min tank | 108 L | 68 L | 81 L |
| Group | 6+ | 12+ | 8+ |
| Temperature | 73–82°F (23–28°C) | 68–79°F (20–26°C) | 70–82°F (21–28°C) |
| Eats shrimp | Yes | Yes | — |