Dwarf fish which include Guppies and Danios, Corydora catfish, pigmy suckermouths, groups of barbs or tetras Plecostomus catfish, or perhaps plecos for brief, are a big group of South American Catfish that hold out on the bottom of lakes and rivers and graze on rocks and driftwood. Plecos are fantastic https://pearlaquatics.my/how-to-set-up-your-first-aquarium/