The Rubberlip Pleco (Chaetostoma sp.) is a sturdy and highly effective algae-grazing catfish native to the fast-moving, well-oxygenated rivers and streams of Colombia and Venezuela in South America. The most distinctive feature of this species is its large, rubbery lips — wide and fleshy mouthparts adapted to clamping tightly onto smooth rock surfaces in turbulent water while rasping algae. The body is typically brown to grayish with a spotted or mottled pattern providing natural camouflage against rocky riverbeds. Growing to approximately 18 cm, the Rubberlip is a medium to large pleco that requires a spacious aquarium. Its natural habitat consists of clear, cool, highly oxygenated mountain streams and river rapids — conditions that should be approximated in captivity. Unlike many Amazonian plecos, the Rubberlip prefers cooler water temperatures in the 20–26°C range, which limits compatibility with some tropical species but makes it an excellent choice for temperate community tanks. The Rubberlip is a dedicated herbivore that grazes algae almost exclusively in the wild, supplemented by biofilm and plant material. It is a solitary, peaceful species that ignores other fish occupying different water levels. Males can be territorial toward other plecos of similar size. Smooth rocks, driftwood, and fine substrate replicate its natural environment. Caves and crevices are appreciated for shelter and potential breeding activity.
