fish · Loricariidae
Common pleco
Hypostomus plecostomus
Wild range: Guianas coastal drainages (Oyapock to Essequibo); type locality Suriname River (South America)
At a glance: Common pleco care
Compiled reference information. Review the care notes and original sources below.
What temperature is listed for Common pleco?
The compiled profile lists 22.0–28.0 °C for Common pleco (Hypostomus plecostomus). Check the original sources below for context and differing recommendations.
What tank size is listed for Common pleco?
The profile lists a minimum tank volume of 75.0 US gallons (284.0 liters). Volume alone does not establish suitability; consider dimensions, group size and other inhabitants alongside the full care notes.
What pH is listed for Common pleco?
The compiled profile lists a pH of 6.5–7.8. Review the cited care sources alongside the other water parameters in this profile.
Natural habitat
Armored suckermouth loricariid of slower lower-river reaches, tidal muddy bottoms, banks, snags and swamps in the Guianas. Facultative air-breather; rasps algae and takes small crustaceans. Heavy scute armor and a ventral suckermouth.
Where they are found
Valid name Hypostomus plecostomus (Linnaeus, 1758) per ITIS (TSN 164342) and Eschmeyer Catalog of Fishes. Native range is Guianas coastal rivers (FishBase/Weber et al. 2012)—not a pan-Amazon cosmopolitan. TRADE WARNING: pet-store “common pleco / Hypostomus plecostomus” labels are frequently wrong; most large brown suckermouths sold are Pterygoplichthys sailfins (P. pardalis, P. disjunctivus, P. gibbiceps, etc.), which grow larger (~45–60 cm) and are invasive when released. Count dorsal soft rays: Hypostomus typically ~7; Pterygoplichthys usually ≥10. Adult length band here (20–50 cm) spans FishBase’s 25 cm SL for verified H. plecostomus and trade/literature figures up to ~50 cm; do not assume a 3-inch store juvenile will stay small.
Aquarium care
Plan a large, well-filtered aquarium from day one: Aqueon and Aquarium Co-Op both cite about 75 US gallons as a practical minimum for common pleco, with ACO noting eventual upgrades toward 180–500 gal as the fish grows and LiveAquaria listing ~120–125 gal for mature trade stock. Provide driftwood, caves/hollow logs and moderate–strong circulation with high dissolved oxygen; these fish produce a heavy bioload. Keep nitrates low with routine water changes. Not a nano or “algae eater for a 10-gal” species—buy bristlenose/rubberlip/clown if space is limited. Never release outdoors (invasive sailfin lookalikes).
Feeding
Omnivore: wild diet includes algae and small crustaceans (FishBase). In aquaria do not rely on tank algae alone—offer sinking algae wafers/rounds, blanched zucchini/green beans, and protein (bloodworms, shrimp pellets, gel foods). Adults need more food than juveniles; feed after lights-out so nocturnal scrapers get their share. Underfed large plecos may rasp other fishes’ slime coats.
Compatibility
Generally community-safe with similarly sized peaceful fish (Aqueon, ACO, LiveAquaria). Territorial toward other bottom-dwellers and conspecifics—offer multiple caves. Avoid tiny fish that fit in the mouth and very aggressive tankmates that can injure them. Pair with robust South American community or larger cyprinids in big tanks; not for shrimp nano setups.
Breeding
Egg-layers that deposit on smooth rocks or in depressions/caves; eggs guarded by one or both parents (FishBase). Intentional breeding needs a very large setup; Aqueon rates suckermouth breeding as difficult. Fry need frequent high-protein microfoods.
Sources
Compiled from multiple independent care sheets — not copied from a single site.