Dwarf fish like Guppies and Danios, Corydora catfish, pigmy suckermouths, teams of barbs or tetras Plecostomus catfish, or perhaps plecos for brief, are a big group of South American Catfish that hang out on The underside of lakes and rivers and graze on rocks and driftwood. Plecos are great algae https://pearlaquatics.my/3-ways-to-judge-a-professional-pond-cleaner/