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The Congo Tetra Phenacogrammus interruptus is timid, but an incredibly beautiful fish. It is the most gorgeous of the true African Characins. Its body has luminescent rainbow colors and its dorsal, anal, and tail fin develop into the most beautiful feathery appendages.
This is a peaceful schooling fish with males that can reach up to over 3 inches (8.5 cm) in length. A group of these good sized fish need a large aquarium, not only to provide plenty of room to swim around, but to thrive and develop their full beauty as well.
The Congo Tetra prefers soft, peat filtered water and a darker substrate. They are most comfortable in an aquarium with lower light levels which can be provided by floating plants. The beautiful rainbow colors of this fish will also show off best in lower light levels. These fish are easily frightened by aggressive tank mates and loud noises. Do not tap on the glass! These fish are also timid eaters and may wait for you to leave the aquarium before they will feed.
The Congo Tetra Phenacogrammus interruptus was described by Boulenger in 1899. This species is listed on the IUCN Red List as Least Concern (LC) as it has a wide population and no major widespread threats. They are found in Africa, in the Zaire River region of the upper Congo Basin which is slightly acidic and murky waters. They swim in schools and feed on worms, crustaceans, insects and plant matter.
Scientific Name: Phenacogrammus interruptus
Social Grouping: Groups
IUCN Red List: LC - Least Concern
The Congo Tetra has a full-bodied typical tetra shape with rather large scales. The male will reach about 3 1/3 inches (8.5 cm) in length and the female will reach about 2 1/3 inches (6 cm). They have a lifespan of between 3 to 5 years in the home aquarium.
When mature, the fluorescent colors of the Congo Tetra run through the fish from front to back starting with blue on top changing to red through the middle, to yellow-gold, and back to blue just above the belly. The fins are grayish violet with white edges.
Size of fish - inches: 3.4 inches (8.51 cm) - The males get up to 3.5 inches (8.9 cm). Females up to 2.75 inches (6 cm).
Lifespan: 5 years - They have a life span of about 3 - 5 years in the aquarium.
Fish Keeping Difficulty
The Congo Tetra is moderately hardy and suggested for a fish keeper with some experience. Be careful picking tankmates as this peaceful long finned tetra is often a target of attacks which can stress it out and the injuries can lead to diseases and death.
Aquarium Hardiness: Moderately hardy
Aquarist Experience Level: Intermediate
Foods and Feeding
In the wild the Congo Tetra feeds primarily on insects, but also eats worms, crustaceans, insects and plant matter. Since they are omnivorous the Congo Tetra will generally eat all kinds of live, fresh, and flake foods. To keep a good balance give them a high quality flake food everyday. Feed brine shrimp (either live or frozen) or blood worms as a treat. It is best to feed several times a day and only what they can consume in 3 minutes or less at each feeding.
Diet Type: Omnivore - In the wild these fish are primarily insectivores but can usually be trained to take live foods, large flakes, and pelleted foods.
Flake Food: Yes - Provide large flakes.
Tablet Pellet: Yes
Live foods (fishes, shrimps, worms): Some of Diet
Vegetable Food: Some of Diet
Meaty Food: Some of Diet
Feeding Frequency: Several feedings per day
Congo Tetras are not exceptionally difficult to care for provided their water is kept clean. Aquariums are closed systems and regardless on size all need some maintenance. Over time decomposing organic matter, nitrates, and phosphate build up and the water hardness increases due to evaporation. To combat these ever changing conditions water should be replaced on a regular basis, especially if the tank is densely stocked. At least 25 - 50% of the tank water should be replaced every other week.
Water Changes: Bi-weekly
The Congo Tetra has been successfully kept and even bred in aquariums as small as 20 gallons. It’s commercially bred in huge numbers so it is adaptable and will thrive in most well-maintained tanks. But because they really need to be kept in schools of at least six fish, an aquarium that is at least 40 gallons or larger is recommended. Water should be on the acidic side of neutral and soft with good circulation. Using dim lighting will develop the tetras best coloring.
To get the best out of this fish, set up a biotype tank. These fish prefer some plant cover and a darker gravel. It does look particularly effective in a heavily-planted setup and can appear a little washed out the decor is too sparse. For the substrate use a river sand with some drift wood and twisted roots. Add some dried leaves to the tank, which will stain the water a light brown, and then replace leaves every few weeks.
Minimum Tank Size: 40 gal (151 L) - This fish should be kept in groups of at least six and requires plenty of swimming space.
Suitable for Nano Tank: Sometimes
Substrate Type: Any
Lighting Needs: Low - subdued lighting - Low lighting and a shadowy tank set up will bring out the best coloration on this fish.
Temperature: 73.0 to 82.0° F (22.8 to 27.8° C)
Range ph: 6.0-7.5
Hardness Range: 4 - 18 dGH
Water Movement: Moderate
Water Region: All - These fish will swim in all areas of the aquarium.
They are generally a good community fish but they may try to bite smaller fish. Also, watch that they don't eat your smaller plants. They sometimes like to nibble on softer plants and young shoots. Best tank mates for this fish are other tetras, rainbowfish, Corydoras, Loricariids, Synodontis, and some peaceful Cichlids. Do not keep Congo Tetras with fish that are known to nip fins as male Congo's will be injuried.
Same species - conspecifics: Yes
Peaceful fish (): Safe - This fish has a very timid temprament and should not be housed with aggressive or fin nipping fish.
Semi-Aggressive (): Threat
Aggressive (): Threat
Large Semi-Aggressive (): Threat
Large Aggressive, Predatory (): Threat
Slow Swimmers & Eaters (): Safe
Shrimps, Crabs, Snails: Safe - not aggressive
Plants: Monitor - They may snack on soft plant matter and new shoots.
Sex: Sexual differences
The male is larger with more color, also the tail fin and dorsal fin are more extended. If you look at the picture above, you can see the extension at the center of the tail fin. A mature female will be more rounded.
The Congo Tetras are egg layers. Some keys to breeding them is to provide a large aquarium with peat filtered water and bright lighting to initiate spawning. They will lay up to 300 eggs that will drop to the bottom. The fry are large enough to eat freshly hatched brine shrimp. For a description of breeding characin fish, see Breeding Freshwater Fish: Characins.
Ease of Breeding: Moderate - Getting a pair to spawn is moderately difficult. The morning sun will initiate a pair to spawn in more shallow water. The parents should be removed after spawning.
The Congo Tetras are fairly hardy and disease is not usually a problem in a well maintained aquarium. However they are prone to developing ick if kept in colder temperatures. Also anything you add to your tank can bring disease. Not only other fish but plants, substrate, and decorations can harbor bacteria. Take great care and make sure to properly clean or quarantine anything that you add to an established tank so not to upset the balance.
A good thing about Congo Tetra is that due to their resilience, an outbreak of disease can often be limited to just one or a few fishes if you deal with it at an early stage. When keeping more sensitive types of fish, it is common for all fishes to be infected even before the first warning signs can be noticed. The best way to proactively prevent disease is to give your fish the proper environment and give them a well balanced diet. The closer to their natural habitat the less stress the fish will have, making them healthier and happy. A stressed fish is more likely to acquire disease.
As with most fish the Congo Tetras are prone to skin flukes, parasitic infestations (protozoa, worms, etc.), ichthyobodo infection, parasitic infestations (protozoa, worms, etc.), bacterial infections (general), and bacterial disease. It is recommended to read up on the common tank diseases. Knowing the signs and catching and treating them early makes a huge difference. For information about freshwater fish diseases and illnesses, see Aquarium Fish Diseases and Treatments.
The Congo Tetra is readily available but is more expensive than many tetras.
Ted22 - 2012-02-22 I've got 19 of these beauties in a 100gal in an african biotope tank with other congo basin species of fish, mixed sex group, the males look stunning. All the males are around 4 inches and what I thought was fully grown. Looked in the local fish shop today and they had large congos for sale. a good 5 inches + they dwarfed my fish. The person who said they grow this big was talking complete sense, nothing documented online for congo tetras of this size but they do exsist and presumably all have the potential to grow to this size (unless they were hormone treated or something). Fantastic fish, definately more rowdy than this article makes them out to be, voracious feeders they swarm and tear food apart like a group of beautiful pirahnas, all my fish are large semi aggro and the congos hold thier own wonderfully! Just another thing, I wouldnt keep a group of these in anything less than a 4 ft tank, they certainly like their swimming space!
MIke C - 2004-11-28 These Fish are amazing, the colouration of them is usually not seen while at the store, but once they grow up a bit they glow (more obvious when not looked at straight on).
They can reach a max length of 5" tho, so make sure you have a larger tank for these fish. I have 4 in a 75Gal and they play well, tho they are agressive when fed (will knock other fish out of the way for food)
Alex Burleson - 2012-01-09 They are certainly a beautiful, and exciting specimen for most community aquariums!
Mike - 2010-02-27 Beautiful fish. I have 7 in a 30 gallon in addition to some other fish.
Someone here said they reach a max of 5 inches, but everything everywhere I've read said that males get to 3.5 inches, and females stay closer to 2.5 inches.
they seem to get along well in a community tank.
Plus, you have the joy of having very rare tetras which 90% of other people don't have.
I take pride in having rare fish. And the Congo's fit right in with my African Butterfly, Leopard Ctenopoma, Female Krib, and cories.
cheryl - 2010-09-04 I have some of these & am going to expand the school as a larger fish in the tank died. They are beautiful & mine are not timid at all. I have the ones that look more olive green/electric blue & I am having a hard time finding more of those. Mine are getting along nicely with African Red Eyed Tetras (another less known, awesome fish! - not to be confused with Red Eye Tetras) a Giant Danio that has a blue-green sheen to him, a large killifish (that I believe was mislabeled as a gardneri) & a couple of peppered cory cats. I have a blue-green iridescent thing going on somehow... I have a Leopard Ctenopoma that i would be afraid to put with these because he is (& so has every other one I've owned) a little on the aggressive side. They like to chase other fish, especially when the lights are out. They are one of my favorite fish.