Dwarf fish like Guppies and Danios, Corydora catfish, pigmy suckermouths, groups of barbs or tetras Plecostomus catfish, or simply just plecos for short, are a significant team of South American Catfish that dangle out on the bottom of lakes and rivers and graze on rocks and driftwood. Plecos are perfect https://pearlaquatics.my/product/xinyou-biological-sponge-filter/