Rubber Lip Pleco (Chaetostoma sp.)

Rubber Lip Plecos (Chaetostoma sp.) get their name from a genuinely distinctive, thick-lipped sucker mouth built for near-constant grazing — the lip structure gives them a grip on algae-covered rock surfaces that more rounded-lipped plecos can't match. In their native Andean stream habitats across Colombia and Ecuador, they live in fast, well-oxygenated water, clinging to rock faces in strong current and rasping away at algae and biofilm all day. That stream-adapted lifestyle translates well to aquarium life: they're low-drama, reliably useful algae eaters that don't develop the territorial aggression some larger pleco species do as they age.

They stay on the smaller, milder side of the loricariid family — typically 4–5 inches at full size — which makes them a practical algae-control option for tanks in the 30–75 gallon range where a Common Pleco would be a long-term problem. They're most active during the evening and overnight, but unlike some nocturnal plecos, a well-fed Chaetostoma is visible and active during daylight hours, which is part of the appeal.

Give them driftwood and a variety of surface types. They graze on wood as well as rock and glass, and a tank with only smooth surfaces limits their behavioral range and their foraging efficiency. Supplement natural grazing with algae wafers, blanched zucchini, and occasionally cucumber.

Scientific name: Chaetostoma sp. (Rubber Lip complex; several species sold under this common name)
Origin: Fast-flowing Andean streams and rivers in Colombia and Ecuador — rocky, high-oxygen habitats
Water parameters: Temp 65–79°F · pH 6.5–8.0 · GH 5–20 (prefer well-oxygenated, slightly cool water)
Tank requirements: 30 gal minimum; provide rock, driftwood, and varied surface textures; moderate to strong flow preferred
Diet: Herbivore — algae, biofilm, algae wafers, blanched vegetables; supplement with driftwood for rasping
Compatibility: Peaceful; males may compete but rarely injure each other; safe in most community setups
Husbandry note: Chaetostoma are more temperature-sensitive than tropical plecos — they thrive in the 68–75°F range and become stressed above 80°F. In warm tanks running at 78–82°F for discus or rams, a Rubber Lip Pleco will be uncomfortable. Match the temperature to the pleco, not the other way around.