Synodontis Catfish
Synodontis sp.
Min Tank Size
150L
Adult Size
20 cm
Lifespan
15 years
About
Synodontis is a massive African catfish genus spanning well over 130 described species, so buying one labeled simply 'Synodontis' at a fish store is a bit of a gamble until you pin down the exact species. Most hail from the river systems and lakes of central and west Africa, including the Congo Basin and the African Great Lakes.
The most famous member is S. nigriventris, the upside-down catfish, which genuinely swims and feeds inverted at the water surface. Other popular species include S. multipunctatus, S. petricola, and S. eupterus, each with distinct patterning and size ranges. Coloration across the genus typically runs toward silver, grey, or brown bases with black spots or mottling, and most have the classic armored, mildly shark-shaped catfish body with prominent spines in the dorsal and pectoral fins. Those spines can lock into a defensive position and cause real puncture wounds if you're not careful during handling or netting.
Water parameters are flexible for most species, tolerating a pH range from soft acidic water up through the hard alkaline conditions of Lake Tanganyika setups. Most species do best around 24 to 26 degrees Celsius. Diet-wise they're opportunistic omnivores, happy to take sinking pellets, frozen bloodworms, and the occasional algae wafer.
Activity is mostly nocturnal, so if you want to actually see yours, a dim-lit tank with plenty of caves and overhangs is the way to go. Hardy and forgiving of minor water quality lapses, they're a solid pick for anyone setting up an African-themed setup or a larger community.
Water Parameters
Temperature
°CpH
GH
dGHKH
dKHSwimming Level
Flow Preference
Keeping multiple Synodontis Catfish together
Synodontis Catfish is strongly territorial. Multiples fight over space unless the tank is large enough for each to claim its own area. A single individual is the safer default.
Compatibility
Synodontis work well with African cichlids, including peacocks, haps, and Tanganyikan species, largely because they share similar water parameter needs and can hold their own against moderately aggressive tankmates. They're a classic pairing in Lake Malawi and Lake Tanganyika setups. Avoid keeping them with nano fish like small tetras, rasboras, guppies, or any shrimp, as losses will happen overnight. Multiple Synodontis can coexist in larger tanks with plenty of territory to go around, but in smaller setups one specimen per tank is safer. Robust community fish like large barbs, rainbowfish, or bigger South American catfish can work depending on species.
Commonly kept with
Species this one is most often paired withCommonly tried but avoid
Often paired, but shouldn't beCare Notes
The biggest beginner mistake is not researching the specific species before buying. A fish labeled 'Synodontis' could be a 10cm dwarf species or something that will eventually hit 35cm. Always get a species ID before purchasing. Feeding is straightforward but remember these fish are nocturnal, so drop sinking food after lights out or they may go underfed while more aggressive daytime fish clean up. Their dorsal and pectoral fin spines can get tangled in nets, so use a container to catch them instead. Water quality needs to be consistent, but they're more tolerant of parameter swings than most African rift lake species.
Behavior & Aggression
Synodontis aren't generally bullies toward fish that stay out of their space, but they can be assertive about territory, especially around caves and hiding spots. If two individuals are kept in a tank without enough cover, chasing and fin-clamping becomes common. Toward smaller fish, shrimp, and snails, the aggression is more predatory than territorial. They rarely chase midwater fish unprovoked, but anything small enough to fit in their mouth at night is at risk. Providing multiple caves significantly reduces conspecific conflict.
Things to Know
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