Dwarf fish including 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 dangle out on the bottom of lakes and rivers and graze on rocks and driftwood. Plecos are wonderful algae https://pearlaquatics.my/product-category/air-pump/