Why is my Upside-Down Catfish swimming normally?

It is perfectly normal for them to swim right-side up occasionally, especially when foraging on the substrate. They typically adopt the upside-down posture when resting under objects or when surface feeding.

Do they need to be kept in groups?

Yes, they are a shoaling species. Keeping them in groups of five or more reduces stress, encourages natural behaviours, and makes them far more likely to venture out during the day.

What do Upside-Down Catfish eat?

They are omnivores. Provide a mixed diet of sinking catfish pellets, standard flakes, and regular offerings of live or frozen foods like bloodworm and mosquito larvae.

Can they live with small shrimp?

While generally peaceful, they are opportunistic omnivores. Extremely small dwarf shrimp might be eaten if they fit into the catfish's mouth, but larger species like Amano shrimp are usually safe.

Why is my catfish always hiding?

If kept in a brightly lit tank without sufficient overhead cover or conspecifics, they will naturally hide. Ensure you have floating plants, broad-leaved Anubias, and a proper shoal to help them feel secure.

FreshwaterTropicalBeginner

Upside-Down Catfish

Synodontis nigriventris

A fascinating and peaceful African catfish famous for its peculiar habit of swimming upside down beneath leaves and driftwood.

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Ideal Conditions

Temperature: 22 – 26 °C
pH range: 6 – 7.5
Hardness: 4 – 15 dGH
Adult size: 8 – 10 cm
80L for a small shoal: 80 litres+
Lifespan: 5 – 10 years
Diet: Omnivore
Water flow: moderate
Preferred setup: Heavily planted with broad-leaved plants and overhanging driftwood

About the Upside-Down Catfish

The Upside-Down Catfish (Synodontis nigriventris) is a highly popular and enduring species in the aquarium trade, cherished for its unique posture and peaceful nature. Native to the densely vegetated streams of the Congo River basin, this fish has evolved to swim and feed with its belly facing the water's surface. Unlike many other catfish species, it is frequently seen in the mid-water regions of the tank, particularly when navigating around driftwood and large plants.

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Is it right for your tank?

Check Upside-Down Catfish against a habitat you already keep. We compare water type, temperature, pH, adult size, group needs and everything living there.

Where Upside-Down Catfish comes from

Native range

Congo River basin, Central Africa

Countries / regions

Democratic Republic of the Congo, Republic of the Congo, Central African Republic

Habitat

Slow-moving tributaries, densely vegetated streams, and flooded forest floors rich in overhanging foliage.

Widespread throughout the central Congo basin.

Similar species

Featherfin Squeaker
Synodontis eupterus
Cuckoo Catfish
Synodontis multipunctatus
Asian Upside-Down Catfish
Mystus leucophasis

We’re adding more full species guides as the catalogue grows.

Compatible tank mates

Reviewed guidance based on this species' recorded traits.

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Congo Tetra
Phenacogrammus interruptus
Peaceful, mid-to-top dwelling schooling fish from similar West/Central African waters that will not interfere with the catfish.
Great
Bronze Corydoras
Corydoras aeneus
Peaceful bottom dwellers that share similar water requirements and peacefully co-exist alongside Synodontis.
Great
African Butterfly Fish
Pantodon buchholzi
A surface dweller from similar biotopes that stays out of the catfish's way and appreciates the same planted, calm conditions.
Great
Kribensis
Pelvicachromis pulcher
Can share the same tank, but Kribensis become highly territorial when breeding and may harass bottom-dwelling catfish.
Compatible with caution
Tiger Barb
Puntigrus tetrazona
Known fin-nippers that might harass the catfish and nip their dorsal fins or barbels if not kept in a large enough school themselves.
Compatible with caution
Oscar
Astronotus ocellatus
Large, aggressive cichlids that will easily consume or severely injure an Upside-Down Catfish.
Not recommended

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