A small, peaceful African catfish famous for genuinely swimming upside down, an adaptation for grazing food from the undersides of leaves and the water surface. Hardy, social, and the most aquarium-friendly Synodontis, it suits relaxed community tanks.
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Small mottled catfish reaching about 8-10 cm (3-4 in); notable for swimming belly-up.
Lifespan
5–15 years
Social needs
group
Native region
Africa (Congo River basin, Central Africa)
Origin
Old World
Climate
🌴 Tropical
Water type
💧 Freshwater
Family
Mochokidae
Genus
Synodontis
Part of the Catfish
Catfish are a diverse order of mostly bottom-dwelling fish, including peaceful shoaling corydoras, armored loricariids, and scavengers prized for keeping the lower levels of an aquarium active and clean.
From the minimum an animal needs to be kept humanely, up to the ideal setup. Bigger is almost always better — minimums are floors, not targets.
Photo coming soon
Minimum
Group community tank
30 gal / 110 L (group of 4+)
Synodontis nigriventris reaches 10 cm and swims inverted under overhangs. Group of 4+, driftwood/leaf canopies, warm soft water (24–28 °C), gentle flow.
Photo coming soon
Recommended
Long planted community
40–55 gal / 150–200 L
Larger group of 5–6 in a planted tank with driftwood overhangs for inverted resting. Pair with peaceful African or general community tankmates.
Photo coming soon
Ideal
West African biotope
75 gal+ / 280 L+ biotope
Long biotope with driftwood overhangs, leaf litter, and small group. Natural inverted swimming and surface-feeding behaviour visible.
Life & growth stages
How this animal changes through its life — each stage often has its own care, diet and space needs.
Photo coming soon
Egg
Fish eggs are small, translucent spheres, often laid in clutches on plants, substrate, or in a nest — or carried/brooded by a parent in livebearing and mouth-brooding species. A dark eye spot and the curled embryo become visible inside as development progresses.
Photo coming soon
Fry
Newly hatched fry are tiny and semi-transparent, frequently still carrying a yolk sac that fuels them before they feed freely. They lack full fin structure and adult coloration, staying near cover until they can swim and forage on their own.
Photo coming soon
Juvenile
Juveniles look like miniature adults but with developing fins and muted or different markings; many species shift pattern and color as they mature. Growth is rapid at this stage given clean water and steady feeding.
Adult
Adults show the species' full size, finnage, and mature coloration, and are sexually mature. Many fish develop sex-specific differences in size, color, or fin shape, which can intensify during breeding.
Habitat & enclosure
A small group needs a tank of at least 110 litres (30 US gal); they are sociable shoalers that do best in numbers of three to five or more. Provide plenty of caves, driftwood, broad-leaved plants, and overhangs, since they like to rest and feed inverted beneath surfaces, with dim or shaded areas for their nocturnal habits.
They are tropical: keep water at 22-26 C (72-79 F), pH 6.0-7.5, soft to moderately hard, with steady filtration and moderate flow. They are hardy and forgiving once established, but still benefit from stable water and regular changes to keep nitrates low.
Substrate
Use fine sand or smooth gravel to protect their barbels during foraging. Add driftwood, caves, and broad-leaved plants so they have overhangs to rest beneath in their characteristic inverted posture.
Equipment & setup
Provide reliable filtration with moderate flow and a heater for stable tropical temperatures. Subdued or planted lighting suits their nocturnal nature, and a secure lid is sensible since active catfish can jump.
Diet
Omnivorous and easy to feed: offer sinking pellets, catfish wafers, frozen and live bloodworms, brine shrimp, daphnia, and flake. Uniquely, they will rise to take floating foods from below while swimming inverted, grazing the surface and leaf undersides.
Feed in the evening to match their nocturnal activity, and provide both meaty and plant-based foods for balance. They are competent scavengers but should be fed deliberately rather than relying solely on leftovers; a varied diet keeps their mottled coloration strong.
Behavior & temperament
Peaceful, social, and well-suited to community tanks; keep them in groups, as they are gregarious and more confident in company. They get along with tetras, barbs, rasboras, gouramis, and peaceful cichlids, and ignore most tankmates. Anything small enough to swallow could be eaten at night, but this is rare given their modest size.
They spend much of their time inverted, especially when feeding or resting under cover, with countershaded coloring (dark belly, lighter back) that matches this lifestyle. Mostly nocturnal, they emerge to forage at dusk and after lights-out.
Health
Hardy by Synodontis standards but, being largely scaleless, still sensitive to ich and to copper- and salt-based treatments, which should be dosed cautiously. Poor water quality can cause barbel erosion, fin rot, and skin infections.
Their sharp, locking pectoral spines tangle in nets and can injure handlers, so transfer them in a container. Quarantine new fish, keep water clean and stable, and offer a varied diet to prevent bloat and maintain long-term health.
Tips, DIY & hacks
Buy several rather than one, as they are far more settled and visible in a group. Provide overhangs and broad leaves so you can watch their signature upside-down grazing, and feed after lights-out to see them at their most active.
