Should I buy it?
Cuckoo / petricola catfish
Synodontis petricola
Also known as: petricola catfish, petricola, cuckoo synodontis (trade; verify exact s. petricola vs. lookalikes)
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.
Cuckoo / petricola catfish tank mates · 200L tank size hub
peaceful · intermediate care
Sources & confidencehigh · partially verified · beginner: caution
Checked against several solid care sources that mostly agree. Numbers here are a careful starting point. Your tap water, tank size, and habits decide the rest. How we evaluate.
Best for: African cichlid tanks 200L or more with very hard water and a group of three or more petricola.
Avoid if: Soft water, South American setups, or tanks without substantial rockwork for the catfish to use.
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.
Top things that go wrong
- Mouth gap vs tiny tank mates. May eat tank mates small enough to fit the adult mouth — plan adult sizes, not shop sizes.
- Shrimp & snails. Not shrimp-safe — adults, fry, or both get eaten.
What most shops don't tell you
- 1.Myth: a single petricola catfish thrives as a novelty bottom fish in any African cichlid community. Reality: solos hide permanently — keep four or more in hard alkaline water with rock cover so they finally shoal and feed openly together.
- 2.Predation risk scales with gape, night feeding, and crowding. 'they grew up together' is a schedule, not a law.
- 3.Classed peaceful for similar-sized community use. Still a bite-sized risk toward fry or very small comm fish in small volumes.
- 4.One 'cleaner' fish in a 100L. The petricola hides in rockwork and never gets to food before the cichlids do.
- 5.Kept in soft acidic Amazon water without a mineral plan. The species expects hard alkaline Tanganyika chemistry, not the import-line pH.
- 6.Distinguish from S. lucipinnis and similar in trade. Offer sinking foods that reach the rockwork before the cichlids scoff everything at the surface film.
About this species
Petricola are small spotted Synodontis from Lake Tanganyika that suit hard alkaline rockwork tanks. Active at dusk and gregarious in groups of four or more. Will eat very small shrimp and snails. Keep in a wide footprint tank with rock cover.
- Pictus catfish250L min · same fish family
- Twig / whiptail catfish150L min · same fish family
- Emerald catfish (Brochis)120L min · same group, similar adult size
- Bronze corydoras100L min · same fish family
- Sterba's Corydoras100L min · same group, similar adult size
- Upside-down Catfish100L min · same group, similar adult size
- Adolfoi cory80L min · same fish family
- Glass Catfish80L min · same group, similar adult size
- African freshwater butterflyfishalso intermediate peaceful, similar tank size
- Black ruby barbalso intermediate peaceful, similar tank size
- Boesemani Rainbowfishalso intermediate peaceful, similar tank size
- Bolivian Ramalso intermediate peaceful, similar tank size
- Brown / hockey-stick pencilfishalso intermediate peaceful, similar tank size
- Checkerboard cichlidalso intermediate peaceful, similar tank size
No reverse lookups listed yet.
Plan grid
Key limits are above. Here: pH band, swim level, bioload, and activity.
Swim zones
Care snapshot
Quick compare before you buy. Not a score of how “good” the fish is.
- Beginner ease32
- Peacefulness68
- Community fit63
- Small-tank fit90
- Hardiness54
- Energy54
Numbers are deterministic planning indices from Fishori fields — not a scientific score of your individual fish.
Example setups
Starting points only. Run the pair checker for every fish you add.
Rough 200L+ layout: one calm centrepiece, 8–12 small tetras/rasboras, 6–8 corydoras-type bottom fish — verify every name in the pair checker before buying.
Safer directions include: Boesemani Rainbowfish, Molly, Sailfin Molly.
Avoid “one of everything” baskets — Cuckoo / petricola catfish belongs in a plan built around territory, line-of-sight breaks, and matched water chemistry.
Compatibility
Tank mates for Cuckoo / petricola catfish
Usually safer (engine GOOD): Boesemani Rainbowfish, Molly, Sailfin Molly. Conditional (CAUTION — read the pair page before buying): African Cichlid, Chili Rasbora, Corydoras Catfish, Ember Tetra, German Blue Ram. Every name links to a live pair check — the lists are a shortlist, not a stocking plan.
Usually safer
Open a pair page with this fish as the starting point.
Needs planning
Read the blocking rule on each pair page before experimenting.
Usually avoid
Do-not-stock combinations on conservative hobby rules.
None listed. Use the pair checker before mixing.
Compare with
Run a real pair check: Cuckoo / petricola catfish + Boesemani Rainbowfish
- Try Boesemani Rainbowfish — open the pair check.
- Try Molly — open the pair check.
- Try Sailfin Molly — open the pair check.
Behaviour and temperament
Petricola catfish are generally peaceful synodontis that stay bolder in groups of four or more among rockwork in hard water. They do not replace filtration. Stress shows as chronic hiding and thin condition when kept alone under aggressive cichlid feeding stampedes every night.
What sets them off
- Sudden crowding
- Poor water quality
Fin nipping: Not a habitual fin-nipper; stressed or crowded individuals can still test fins.
Predation: May eat tank mates small enough to fit the adult mouth — plan adult sizes, not shop sizes.
Territory: Holds a patch (cave, corner, or surface). Break sight lines so neighbours can pass.
Planted tanks: excellent — easy plant ideas
In the glass: typical and warning signs
- Four or more weave rockwork and appear more after lights soften.
- Open shoaling in a correct group is normal ownership for this species.
- A permanently hidden solo usually means group size failed first.
- Thin flanks under mbuna stampedes mean feeding competition failed.
- Low malice toward similarly sized fish when space is honest.
- Very small fish can still be mouth-sized risk for larger synodontis.
- Grow the group before adding another solitary bottom novelty.
- Feed sinking foods after lights soften so wafers reach the rock base.
Fish behaviour can vary between individuals and tank setups. Always observe new fish closely after introduction.
Water, food, and grouping
Hardness
medium-hard
Diet
omnivore
Petricola catfish are omnivore synodontis that take sinking wafers, frozen foods, and leftovers in hard alkaline African setups. A solo fish often hides and misses feeds while cichlids vacuum the bottom. Offer sinking food after lights soften, keep four or more, and match rockwork so the group can shoal openly.
Shrimp & snails
Not shrimp-safe — adults, fry, or both get eaten.
Schooling species — buy 4+ together. Smaller groups stress and lose colour.
- Hold 24 to 28 °C steadily on a real thermometer, not the dial on the heater.
- Aim for pH 7 to 8.5 and a hardness you can re-test in two weeks. A one-time strip in the shop car park is not a water test.
- Schooling species. Buy 4 or more from the same tank on the same day before adding any centrepiece fish.
- Tank volume meets or exceeds 200L published minimum for adults.
- You can stock at least 4 individuals (group welfare).
- Heater can hold 24–28°C without cooking cooler-water tank mates.
- No known fin-nippers paired with long-finned fish unless you accept documented risk.
- No tank mates small enough to fit the adult mouth gap for this species.
Explore and stocking hubs
Tank-mates hub, matching guides, category peers, and litre stocking lists around this species’ minimum tank.
Plan with tools
Check mates as pairs first, then add this fish in the tank builder for the full stocking.
Filtration & heating
A 200L minimum tank needs a filter rated for at least 800L/hr turnover and a heater to hold 24–28°C reliably.
Plant suggestions
Cuckoo / petricola catfish does well in planted tanks. Plants compatible with 24–28°C and pH 7–8.5:
Research: partially verified · Confidence: high · 3 linked source(s). We do not invent citations.
How Fishori evaluates compatibility (same logic as pair and tank tools).
- Seriously Fish. Synodontis petricola
Primary: aquarium size, water chemistry, behaviour, and compatibility (URL verified in upgrade script; recheck if site content changes).
- FishBase. Synodontis petricola
Secondary: taxonomy, distribution, and maximum length in nature; cross-check with aquarium import lines and measured tank parameters.
- Wikipedia. Synodontis petricola
Secondary: general species context; verify all husbandry numbers against a dedicated aquarium care sheet and your test kit, not a single table row.
Evidence notes
- The Seriously Fish profile for the binomial in this record was successfully reached as the primary aquarium reference.
- FishBase contributes natural-range size and habitat context. Translate those numbers through your heater, your water report, and your tank footprint before stocking.
- Wikipedia is only cited if the article URL returned OK. Use it for orientation, not as the only care sheet for an import.
- All compatibility text reflects typical hobby experience and the Fishori model. Individual fish, shop stress, and the order tank mates are added in can still defy a single-paragraph label.
Common questions about Cuckoo / petricola catfish
- How big do Cuckoo / petricola catfish get?
- Cuckoo / petricola catfish adults reach about 10 cm. Shop fish look smaller; stock for the adult length.
- What size tank does Cuckoo / petricola catfish need?
- 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.
- Are Cuckoo / petricola catfish aggressive?
- Petricola catfish are generally peaceful synodontis that stay bolder in groups of four or more among rockwork in hard water. They do not replace filtration. Stress shows as chronic hiding and thin condition when kept alone under aggressive cichlid feeding stampedes every night.
- Do Cuckoo / petricola catfish need to be kept in a group?
- Schooling species — buy 4+ together. Smaller groups stress and lose colour.
- What is the most common mistake with Cuckoo / petricola catfish?
- Keeping 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.
- What fish can live with Cuckoo / petricola catfish?
- The Cuckoo / petricola catfish profile lists Boesemani Rainbowfish, Molly, Sailfin Molly among its safer pairings (engine-checked GOOD). African Cichlid, Chili Rasbora, Corydoras Catfish, Ember Tetra are conditional (CAUTION): workable only with the specific conditions on each pair page. Run the pair checker for your exact water and tank size before stocking.