Dwarf fish including Guppies and Danios, Corydora catfish, pigmy suckermouths, groups of barbs or tetras Plecostomus catfish, or simply plecos for brief, are a substantial group of South American Catfish that dangle out on The underside of lakes and rivers and graze on rocks and driftwood. Plecos are excellent algae https://pearlaquatics.my/how-to-set-up-an-aquarium/