Cuckoo / petricola catfish tank mates
An African catfish that mimics the synodontis pattern and fits large rift lake setups. A schooling species that needs its own kind and hard water.
Common mistakeKeeping a solo petricola in an African cichlid tank is how keepers invent a permanently hidden fish that never shows. Three or more shoal openly; one vanishes. Buy a group for two-hundred-litre class hard water — loneliness is not enrichment for Synodontis petricola.
Each name below opens a pair check with Cuckoo / petricola catfish. That check is the decision, not the list itself.
Usually safer companions
Conservative shortlist from this profile. Open a pair page before you buy.
The Cuckoo / petricola catfish profile lists Boesemani Rainbowfish as both safe and a recommended pairing. Boesemani Rainbowfish schools in groups of 6 or more, so plan room for the whole group rather than one fish.
The Cuckoo / petricola catfish profile lists Molly as both safe and a recommended pairing. Molly is a peaceful beginner-care species with a 80L minimum. Run the pair checker for your specific tank before stocking.
The Cuckoo / petricola catfish profile lists Sailfin Molly as a recommended pairing. Sailfin Molly is a peaceful beginner-care species with a 120L minimum. Run the pair checker for your specific tank before stocking.
Risky or situational
May work with more water, a mature system, or a species-only setup. Read the pair page before you experiment.
African Cichlid reaches 15cm and is flagged predatory or as likely to eat small fish. Adult-size Cuckoo / petricola catfish at 10cm is inside that gape range. Both species defend territory. The pairing needs a long footprint and rockwork or planting that breaks the sightline between two defended spots. African Cichlid is rated aggressive, so expect chasing, fin damage, or display behaviour directed at Cuckoo / petricola catfish. Run the pair checker before stocking.
Marked risky or situational on the profile. Tank length and group size change the outcome more than a temperament label does.
Marked risky or situational on the profile. Tank length and group size change the outcome more than a temperament label does.
Marked risky or situational on the profile. Tank length and group size change the outcome more than a temperament label does.
Both species defend territory. The pairing needs a long footprint and rockwork or planting that breaks the sightline between two defended spots. Run the pair checker before stocking.
Marked risky or situational on the profile. Tank length and group size change the outcome more than a temperament label does.
Marked risky or situational on the profile. Tank length and group size change the outcome more than a temperament label does.
Pea Puffer is flagged as a fin-nipper and Cuckoo / petricola catfish carries the long-finned risk profile (veil tails, trailing fins). Expect torn fins within days unless the nipper is in a proper group and the long-finned fish has plenty of cover. Pea Puffer is flagged predatory. Equal-size adults usually coexist, but the moment one is stressed, sick, or smaller after a moult, it becomes prey. Both species defend territory. The pairing needs a long footprint and rockwork or planting that breaks the sightline between two defended spots. Pea Puffer is rated semi-aggressive, so expect chasing, fin damage, or display behaviour directed at Cuckoo / petricola catfish. Run the pair checker before stocking.
Fish to avoid with Cuckoo / petricola catfish
Predation, aggression, or space rules on this profile. Treat these as poor default mixes.
None flagged as a hard avoid on this profile.
Tank size and groups
- Published minimum for Cuckoo / petricola catfish: 200L. Group minimum 4 (schooling).
- Compatibility changes when the tank is too short for turning, too little for a real school, or too warm for one species and not the other. That is why pair checks include tank context, not only temperament.
- Nearest litre hub to this minimum: 200L hub.
Easier alternatives to consider
Hardier first-tank names from the library. Still read the profile. Not a substitute for reading this one.
Plan before you buy
Start a pair check with Cuckoo / petricola catfish, or open a starter plan with the top safer companions in the builder.
Tank hubs: 200L
Related reading
Guides that list other fish with the same trait, so you can plan around the group rather than one row.
- Fish that eat smaller tank mates →
Cuckoo / petricola catfish may eat anything that fits in its mouth as it grows.
- Schooling & group fish →
Plan the group of 4+ before choosing tank mates.
- Peaceful community fish →
Other peaceful species to shortlist beside Cuckoo / petricola catfish.
Filtration & heating
A 200L minimum tank for Cuckoo / petricola catfish needs a filter rated for at least 800L/hr turnover and a heater maintaining 24–28°C.
Similar fish (same category)
- Pictus catfish · min 250L
- Twig / whiptail catfish · min 150L
- Emerald catfish (Brochis) · min 120L
- Bronze corydoras · min 100L
- Sterba's Corydoras · min 100L
- Upside-down Catfish · min 100L
- Adolfoi cory · min 80L
- Glass Catfish · min 80L
Cuckoo / petricola catfish tank mates — quick answers
- What fish can live with Cuckoo / petricola catfish?
- Usually safer companions on this hub include Boesemani Rainbowfish, Molly, Sailfin Molly. Open each pair check before you buy — the list is a shortlist, not a guarantee.
- What tank mates should you avoid with Cuckoo / petricola catfish?
- Avoid any species that competes for the same territory, eats juveniles of this species' size class, or requires very different water parameters.
- What size tank do Cuckoo / petricola catfish need for a community?
- 200L is the planning floor for adult swimming space and bioload. A 244L+ tank is the more comfortable long-term footprint. Length and depth matter as much as raw litres for active or territorial fish.