Plecos, or plecostomus, are a diverse group of freshwater fish belonging to the family Loricariidae, commonly found in rivers and streams throughout South America. Known for their distinctive armored bodies and sucker-shaped mouths, these fish play a crucial role in their natural habitats by feeding on algae and detritus. There are many species of plecos, ranging from the popular common pleco (Hypostomus plecostomus) to the colorful bristlenose pleco (Ancistrus spp.), which is favored for its smaller size and unique bristle-like structures on males. Plecos are typically hardy and adaptable, making them suitable for a variety of aquarium setups. They prefer a well-maintained tank with plenty of hiding spots and driftwood, as they enjoy grazing on surfaces. While many plecos start small, some species can grow quite large, so it's important to provide adequate space in the aquarium. Their beneficial algae-eating habits and unique appearances make plecos a popular choice among aquarium enthusiasts.