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FishbeginnerFreshwater

Upside-Down Catfish

Synodontis nigriventris

AnimaliaChordataActinopterygiiMochokidae

📍 Congo Basin, Central Africa

Ask Finn

Fascinating catfish that swims inverted to feed on the underside of leaves and wood. The inverted posture causes its belly to be darker than its back — the reverse of most fish.

Size4"
Min Tank20g
School4+
peaceful
Zonebottom

Care Guide

Diet

Upside-down catfish are omnivores that primarily feed on algae, biofilm, and plant matter found on wood and leaf undersides. Supplement their natural grazing with sinking pellets, algae wafers, and occasional frozen foods like bloodworms or brine shrimp 2-3 times weekly. They are nocturnal feeders, so provide food in the evening when they become active.

Behavior

These catfish are peaceful, nocturnal bottom-dwellers that spend most of their time inverted on wood, rocks, and plant leaves while feeding on algae and biofilm. They are social and should be kept in groups of at least 4 to reduce stress and encourage natural schooling behavior. They are generally shy and inactive during the day, becoming more active after lights are dimmed.

Breeding

Breeding in captivity is difficult and rarely achieved in home aquariums. They are cave spawners that require specific conditions including stable water parameters, plenty of hiding spots, and mature biofilm-rich environments. Fry are rarely seen in community tanks, and successful breeding requires dedicated breeding setups with minimal disturbance.

Common Diseases

Ich (Ichthyophthirius multifiliis)

Symptoms

White spots on body and fins, rapid breathing, lethargy, rubbing against objects

Treatment

Raise temperature gradually to 28-29°C, perform water changes, use ich medication if severe; maintain excellent water quality

Fin Rot

Symptoms

Frayed or deteriorating fins, discoloration at fin edges, lethargy

Treatment

Improve water quality through frequent water changes, remove decaying wood, treat with antibacterial medication if bacterial infection suspected

Bacterial Infection

Symptoms

Open sores, cloudy eyes, loss of appetite, torn fins, behavioral changes

Treatment

Perform 25-30% water changes daily, maintain pristine water conditions, use broad-spectrum antibiotic treatment if necessary

Stress-Related Illness

Symptoms

Loss of appetite, hiding excessively, pale coloration, weakened immune response

Treatment

Ensure adequate group size (minimum 4), provide abundant hiding spots with wood and plants, maintain stable water parameters and low light

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Quick Facts

pH
6.0–7.5
diet
omnivore
maxSize
4 inches
minTankSize
20 gallons
temperature
72–79°F (22–26°C)

Temperature

72–79°F

22–26°C

Stats

Community tips0
Kept by0 hobbyists