Upside-Down Catfish (Synodontis nigriventris)
 
The Upside-Down Catfish (Synodontis nigriventris) is a unique and entertaining species, well-known for its habit of swimming upside down. Native to the slow-moving rivers and streams of Central Africa, these peaceful catfish are a great addition to community aquariums. Their quirky behavior and hardy nature make them suitable for both beginners and experienced aquarists.
 
Tank Setup for Upside-Down Catfish
Minimum Tank Size: 80 liters
Substrate: Soft sand or fine gravel
Decor: Provide plenty of caves, driftwood, and dense plants to mimic their natural habitat
Water Parameters:
Temperature: 23°C–27°C
pH Range: 6.0–7.5
Water Hardness: Soft to moderately hard
Filtration: Gentle to moderate water flow with effective filtration
Lighting: Low to moderate, as they are nocturnal and prefer dimly lit environments
 
Diet and Feeding
Upside-Down Catfish are omnivorous and will accept a variety of foods, including:
High-quality sinking pellets and wafers
Live or frozen foods like bloodworms, brine shrimp, and daphnia
Blanched vegetables such as zucchini and cucumber
Occasional protein-rich foods for balanced nutrition
 
Behaviour and Tank Mates
Temperament: Peaceful and social
Ideal Tank Mates:
Tetras, Rasboras, and other small peaceful fish
Corydoras catfish
Dwarf cichlids like Apistogramma
Other Synodontis species
Avoid: Large or aggressive fish that may intimidate them
 
Breeding Upside-Down Catfish
Breeding in home aquariums is challenging but possible:
Provide soft, slightly acidic water with plenty of hiding spots
Males and females engage in courtship, and eggs are usually laid on cave ceilings
Remove adults after spawning to protect eggs from being eaten
Feed fry infusoria or finely crushed flakes for healthy growth
 
FAQs
Why do they swim upside down?
This is an adaptation that allows them to feed more easily on the underside of leaves and driftwood.
How big do they grow?
They reach about 8–10 cm in length.
Are they aggressive?
No, they are peaceful and get along well with other non-aggressive fish.
Do they need to be kept in groups?
They do best in small groups of 3 or more, as they are social fish.
 
Species Overview
Species: Synodontis nigriventris
Common Name: Upside-Down Catfish
Origin: Central Africa (Congo Basin)
Diet: Omnivore
PH Range: 6.0–7.5
Temperature: 23°C–27°C
Max Size: Up to 10 cm
Tank Size: Minimum 80 liters
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