Mochokidae

Synodontis Congo

Synodontis greshoffi

Synodontis greshoffi, also known as Synodontis Congo, belongs to the family Mochokidae. This catfish is undemanding, hardy and does not bully its tankmates, and its distinctive body pattern is eye-catching. It will, however, swallow any fish small enough to fit in its mouth, so small tankmates are not kept with it.

Tank
from 110 L (29 gal)
Temperature
23 – 27 °C (73 – 81 °F)
Size in aquarium
20 cm (7.9 in)
Acidity
pH 6.5–7.2

Dangerous to small fish

Natural rangeRange on the map
  • Cameroon
  • Democratic Republic of the Congo
  • Republic of the Congo

Tank conditions

Plan the tank stocking
Temperature
23 – 27 °C (73 – 81 °F)
Water pH
Neutral (6.5) – Neutral (7.2)
Water dH
Very soft (3) – Hard (15)
Water salinity
no salt (freshwater)
Size in aquarium
20 cm (7.9 in)
Lifespan
15 years
Temperament
Semi-peaceful dangerous to smaller ones
Toward small fish
a risk to small fish
Required aquarium volume
from 110 L (29 gal)
Lighting
dimmed or moderate
Substrate
soft peat-based
Water flow
weak or moderate
Feeding
Sinking (any)
Keeping
Both solitary and in group flexible
  • Lifespan. A lifespan to expect under good care, not a measured value: it depends heavily on tank volume, water quality and diet — and for selectively bred forms, on their origin as well.
  • Toward small fish. Based on the Predators category in the catalog or the temperament in the species parameters. “A risk to small fish” means the species is not a predator by habit, yet will swallow any fish that fits in its mouth.
  • Required aquarium volume. This is a husbandry recommendation, not a measured value: the volume depends on the keeping mode (both solitary and in group (flexible)), footprint, decor and tank mates.

Care and keeping

Description

Adults can reach up to 20 cm in length in aquarium conditions, although larger specimens are found in the wild. Their bodies are adorned with an intricate pattern on a yellow-brown or cream background. The tail and fins are translucent, with brown speckles. The first rays of the fins are significantly thickened and act as protective spines, guarding the fish from predators. Distinguishing between male and female is quite difficult, as sexual dimorphism is weakly expressed, making sex determination challenging even for experienced aquarists.

Habitat

Its natural habitat includes various biotopes in the vast Congo River basin, predominantly in the territory of the modern Democratic Republic of Congo. This indicates a fairly wide distribution of the species in the wild. Like other members of its genus, Synodontis Congo prefers to stay near the bottom, choosing areas with calm currents and an abundance of shelters.

Behavior and Compatibility

Synodontis greshoffi is known as a peaceful and compatible species. However, its size and omnivorous nature should be considered: it can easily accidentally swallow small fish. It is not recommended to keep it with overly active or aggressive tankmates, which can not only harm the catfish but also suffer from its protective spines. Unlike some other members of the genus, which often engage in territorial skirmishes, especially in small aquariums, this species shows greater tolerance. It can be kept alone or in a group, provided that each individual has enough personal hiding places.

Care and Maintenance

For comfortable keeping of a single specimen, an aquarium of at least 110 liters is required. The decor should include a soft sandy substrate, which will allow the catfish to dig freely without risk of injury. It is also necessary to provide shelters; snags made of roots and tree branches, as well as various decorative elements, are suitable for this. Lighting should be subdued; floating plants will help create natural shading. Under bright light, the Synodontis will most likely spend most of its time in hiding. The rest of the aquarium decor is selected based on the needs of its other inhabitants. When caring for the aquarium, special attention should be paid to the cleanliness of the substrate, preventing silting and the accumulation of organic waste. This not only negatively affects water quality but also increases the risk of infectious diseases. In addition to regular substrate cleaning, it is necessary to perform weekly water changes of 15–20% of the volume with fresh water to maintain biological balance.

Diet

The diet of Synodontis Congo is very diverse and includes almost all common types of food: dry, frozen, and live. It is important to supplement them with vegetable additives, such as shelled peas or cucumber. The food must be sinking.

Breeding and Reproduction

In natural conditions, Synodontis Congo spawns during the rainy season, scattering eggs near the bottom and showing no parental care for the offspring. Stimulating spawning in an aquarium is an extremely difficult task. At the time of preparing this material, no reliable information was found regarding the successful breeding of this species in home aquariums. Currently, Synodontis fry are primarily raised on specialized commercial fish farms.

Diseases

The main cause of most diseases in these fish is unsuitable keeping conditions and poor-quality nutrition. If initial symptoms are observed, it is first necessary to check water parameters and the concentration of dangerous substances such as ammonia, nitrites, and nitrates. If the indicators deviate from the norm, they should be brought back into order, and only then should treatment begin.

How to choose

When purchasing, choose individuals with clean skin without visible damage, ulcers, or white film. A healthy fish should be active during twilight hours, and during the day, exhibit cautious behavior, often hiding in shelters. Avoid specimens with sunken bellies or signs of emaciation, as this may indicate internal parasites or problems adapting to food. In the store, it is recommended to pay attention to the following aspects: — absence of signs of aggression or damaged fins, which may indicate stress from being kept in an overcrowded aquarium; — normal condition of the eyes, which should be clear and free of cloudiness; — absence of rapid breathing, which is often a sign of poor water quality in the retail aquarium.

Compatibility

There are no pair reviews for this species yet — check tankmates in the matcher.

All tankmates

Plants and this fish

Matching water does not mean the plant will stay intact.

Frequently asked questions

The essentials: size, tank volume, water parameters and care

How big does Synodontis Congo get?

An adult reaches 20 cm in length. Plan the tank around the maximum size: the fish quickly outgrows a cramped setup.

What size aquarium does Synodontis Congo need?

The recommended volume is 110 L. A smaller tank speeds up nitrate build-up and raises stress levels.

What water parameters does Synodontis Congo need?

Temperature 23–27 °C, pH 6.5–7.2, hardness 3–15 dGH. Stability matters more than exact values: sudden swings are harder on the fish than a small deviation from the ideal.

How long does Synodontis Congo live?

Around 15 years when kept properly. Lifespan depends directly on tank volume, water quality and a varied diet.

Is Synodontis Congo aggressive?

Temperament: semi-peaceful (dangerous to smaller ones). Not a predatory species, but small fish that fit in its mouth will eventually be eaten.

How many Synodontis Congo should be kept together?

Recommended setup: both solitary and in group (flexible). Ignoring this is a common cause of stress and disease.

What does Synodontis Congo eat?

Diet type: sinking (any). Feed small portions that are finished within a couple of minutes — overfeeding does more harm than underfeeding.

What is the scientific name of Synodontis Congo?

The scientific name of the species is Synodontis greshoffi, family Mochokidae. It also appears in the literature as: Synodontis grenshoffi, Synodontis holopercnus, Synodontis pantherinus.

Similar fishes

Matched by family, categories and overlapping keeping conditions

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Other scientific names and conservation status

Other scientific names
Synodontis grenshoffi, Synodontis holopercnus, Synodontis pantherinus
Categories
Catfish
Conservation status
Least concernLC