rm
Passport
- Family
- Large Plecostomus
- Grows to
- 45 cm (17.7")
- Lives
- 10–15 years
- TemperamentSuggested
- Peaceful
- Care
- Intermediate
- Swims
- On the bottom
- Keep
- One is fine
- Water
- 20–28 °C (68–82 °F)
BrazilVenezuela
Care requirements
i
On record for Common Pleco: adult size, lifespan, minimum tank, temperature, ph, hardness, minimum group, diet, care level, swim level.
Not on record for Common Pleco: tank length.
A figure that is not on record is left out rather than guessed. One marked Suggested comes from keeping knowledge rather than a page.
- Minimum tank 416 L / 110.0 US gal
- pH 6.2–8.2
- Hardness 4–15 dGH
- Diet omnivore
Care notes written from general aquarium knowledge, not from the cited sources.
About
Common plecos are the fish sold to solve a problem and kept for years as a bigger one. They arrive as small suckermouth catfish recommended for algae, and they grow to the length of a forearm — a heavy, armoured animal that outgrows almost every tank it's put in.
They also stop being useful. A juvenile grazes algae reasonably well; an adult wants protein and vegetables, produces an extraordinary volume of waste, and pays little attention to the glass.
They live a long time — the lifespan on the grid above is the figure to plan around — which means a fish bought casually to deal with an algae problem is a commitment of years.
Tank setup
Buy for the adult or buy a different fish. A bristlenose does the same job at a fraction of the size, and it's the honest recommendation for almost everyone.
Give them driftwood. They rasp it and it aids their digestion, and a tank without wood is missing something they actually need.
Provide a cave large enough for a grown fish. They're nocturnal and territorial and they want somewhere to spend the day.
Use sand or smooth gravel and keep decor stable. A large pleco moves things and wedges itself into gaps.
Cover the tank and secure equipment. They're powerful and they'll dislodge a heater.
Feeding
Common plecos are omnivores that shift toward protein as they mature.
Feed sinking algae wafers and vegetables — courgette, sweet potato, cucumber, spinach — alongside sinking carnivore pellets and occasional frozen food.
Feed after dark. They're nocturnal and daytime feeding mostly goes to other fish.
Avoid: relying on tank algae, which will not sustain an adult, and avoid the mistake of thinking a big pleco is fed by the leftovers of the fish above it.
Filtration and flow
Over-filter substantially. An adult common pleco produces more waste than any other fish of comparable size in this catalogue, and it is the defining practical problem of keeping one.
Change water generously and often, and vacuum the substrate.
Give them good flow and oxygenation. They come from flowing rivers and they're large enough to need it.
With plants
Common plecos damage plants, mostly by accident and partly on purpose.
A large one flattens and uproots things simply by moving through the tank, and a hungry one will rasp soft leaves.
Anubias and java fern attached to heavy wood are the only realistic option, and a hardscape layout is what most keepers end up with.
Health
They're hardy and long-lived, and most problems come from a tank that's too small or water that's overwhelmed.
Never net a pleco. The pectoral and dorsal spines lock outward and catch in mesh instantly, and a struggling fish injures itself and can cut you badly. Use a container.
The armour is not scales, and products differ on whether that matters to them. Read the species restrictions before anything goes in, use it exactly as written, and get veterinary advice for a serious illness in a fish that may have years left in it.
Breeding
They're not bred in home aquaria. In the wild they spawn in burrows dug into river banks, which is not something a tank reproduces.
Commercial stock comes from pond farms in warm climates where the fish can dig properly.
If you have one you no longer want, please don't release it. Common plecos have established invasive populations in warm regions around the world, where they damage banks with their burrows and outcompete native species. Rehoming through a club or a shop is the right route.
Tank mates
Avoid13
- Clown Killifish Common Pleco grows to 45 cm against Clown Killifish at 4 cm, big enough to eat it.
- Convict Cichlid Common Pleco grows to 45 cm against Convict Cichlid at 15 cm, big enough to eat it.
- Discus Common Pleco grows to 45 cm against Discus at 14 cm, big enough to eat it.
- Flying Fox Common Pleco grows to 45 cm against Flying Fox at 16 cm, big enough to eat it.
- Golden Wonder Killifish Common Pleco grows to 45 cm against Golden Wonder Killifish at 10 cm, big enough to eat it.
Only with care19
- Chinese Algae Eater Chinese Algae Eater is aggressive and Common Pleco is peaceful.
- Agassiz's Dwarf Cichlid Common Pleco is a risk to Agassiz's Dwarf Cichlid: large plecostomus and sth american cichlids - dwarf are a pairing to watch.
- Amano Shrimp Common Pleco is a risk to Amano Shrimp: large plecostomus and shrimp and yabbies are a pairing to watch.
- Bamboo Shrimp Common Pleco is a risk to Bamboo Shrimp: large plecostomus and shrimp and yabbies are a pairing to watch.
- Blue Bolt Shrimp Common Pleco is a risk to Blue Bolt Shrimp: large plecostomus and shrimp and yabbies are a pairing to watch.
No conflict is recorded with the other 76 species in the database, so nothing to flag.