Dwarf fish including Guppies and Danios, Corydora catfish, pigmy suckermouths, groups of barbs or tetras Plecostomus catfish, or just 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 excellent algae https://pearlaquatics.my/how-to-choose-the-best-sobo-aquarium-pump-for-your-aquarium/