Dwarf fish including Guppies and Danios, Corydora catfish, pigmy suckermouths, groups of barbs or tetras Plecostomus catfish, or simply plecos for short, are a large team of South American Catfish that hold out on the bottom of lakes and rivers and graze on rocks and driftwood. Plecos are great algae https://pearlaquatics.my/5-daily-fishkeeping-routine-tasks/