Synodontis Catfish Care Guide (Synodontis spp.)

Synodontis is a large genus of fascinating African catfish, widely known in the aquarium hobby for their unique behaviors, striking patterns, and tough armor. Some swim almost entirely upside down, some make squeaking noises when distressed, and some are the only fish known to parasitize the breeding behavior of other fish (brood parasitism).

They are incredibly popular because they are one of the few bottom-dwelling fish robust enough, and biologically adapted enough, to share a tank with highly aggressive African Cichlids.

Synodontis catfish have a stout, somewhat humped body covered in tough, leathery skin rather than scales. They feature a heavily armored head and three pairs of barbels (whiskers) used to navigate and find food in the dark. The dorsal fin often has a sharp, serrated spine. Patterns range from the leopard-like spots of the S. multipunctatus (Cuckoo Catfish) to the high-contrast netting of the S. eupterus (Featherfin).

They are widely distributed across the African continent. Species like S. multipunctatus and S. petricola are endemic to the hard, alkaline waters of Lake Tanganyika. Others, like the Upside-Down Catfish (S. nigriventris), inhabit the softer, acidic, heavily vegetated rivers of the Congo Basin.

The primary requirement for all Synodontis is plenty of hiding spots.

• Caves and Crevices: They are nocturnal and will spend the daylight hours wedged into tight spaces. Provide PVC pipes, stacked slate, or large hollow driftwood.
• Substrate: Sand is highly recommended. Sharp gravel can wear down their delicate barbels as they constantly forage along the bottom.
• Lighting: Dim lighting encourages them to venture out during the day. Brightly lit tanks will result in you rarely seeing them.
• Groups: Most species are highly social. Keeping a single specimen often leads to severe shyness. A group of 3-5 is ideal.

Water parameters depend entirely on the specific species you purchase.

• Rift Lake Species (Cuckoo, Petricola): Require hard, alkaline water (pH 7.8-8.5, GH 10-18 dGH, KH 8-15 dKH, TDS 250-450 ppm) to match their cichlid tank mates.
• Riverine Species (Upside-Down Catfish): Prefer softer, neutral to slightly acidic water (pH 6.0-7.5, GH 4-10 dGH, KH 3-8 dKH, TDS 80-200 ppm).

They are generally adaptable but thrive when kept within their specific biotope parameters.

Temperature

72-82 degrees Fahrenheit (22-28 degrees Celsius).

pH

6.0-8.5, species-dependent.

Hardness (GH)

4-18 dGH, depending on species origin.

Carbonate Hardness (KH)

3-15 dKH.

Nitrates

Below 20 ppm.

Water Flow

Gentle to moderate. They appreciate well-oxygenated water but do not need strong currents.

Synodontis are opportunistic omnivorous scavengers. They are excellent at cleaning up leftover food that misses your mid-water fish.

• Staple: High-quality sinking pellets, algae wafers, and shrimp pellets.
• Treats: Frozen bloodworms, blackworms, mysis shrimp, and chopped earthworms.
• Vegetables: Blanched zucchini, cucumber, and peas.
• Schedule: Feed them just before turning the aquarium lights out at night to ensure they get enough to eat without competing with faster daytime fish.

Breeding in the home aquarium is very rare without hormonal injections, with the notable exception of the Cuckoo Catfish, which requires a host mouthbrooding cichlid to rear its young.

Some species like S. lucipinnis (Dwarf Petricola) have been successfully bred in captivity. They spawn in caves or flowerpots, with females laying small amber-colored eggs. The fry can be started on baby brine shrimp or microworms. Breeding often occurs around the full moon cycle.

For most Synodontis, sexing involves examining the genital papilla: females have a rounder, more pronounced papilla, while males have a longer, more triangular one. Females are often plumper and higher-bodied when carrying eggs.