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Upside-Down Catfish
Synodontis nigriventris
Animalia›Chordata›Actinopterygii›Mochokidae
📍 Congo Basin, Central Africa
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.
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.
Tank Mates
Similar size, peaceful algae-eaters with identical water requirements and nocturnal habits
Small, peaceful schooling fish that occupy mid-water column and won't compete for bottom space
Peaceful algae-eater that shares similar nocturnal behavior and biofilm feeding habits
Peaceful invertebrates that help maintain algae and biofilm without competing directly
Hardy plant that provides grazing surfaces and hiding spots without being uprooted
Common Diseases
Ich (Ichthyophthirius multifiliis)
White spots on body and fins, rapid breathing, lethargy, rubbing against objects
Raise temperature gradually to 28-29°C, perform water changes, use ich medication if severe; maintain excellent water quality
Fin Rot
Frayed or deteriorating fins, discoloration at fin edges, lethargy
Improve water quality through frequent water changes, remove decaying wood, treat with antibacterial medication if bacterial infection suspected
Bacterial Infection
Open sores, cloudy eyes, loss of appetite, torn fins, behavioral changes
Perform 25-30% water changes daily, maintain pristine water conditions, use broad-spectrum antibiotic treatment if necessary
Stress-Related Illness
Loss of appetite, hiding excessively, pale coloration, weakened immune response
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