Browse Bristlenose Plecos (Ancistrus) for sale in Coalville on Pet Classifieds. Ancistrus, commonly called bristlenose plecos, are catfish whose needs include suitable shelter and a varied, appropriate diet. Confirm the species and adult size, since common names can be used loosely. Ask about current water conditions and feeding, and plan stocking carefully rather than assuming an algae-grazing fish removes the need for aquarium maintenance.