Many hobbyists are unaware of how important an airstone can be to the performance of their filtration or skimming equipment.
Air stones create upward draw for better undergravel filter action.
They agitate the water surface for better oxygenation. They simulate natural currents or water channels found in natures water habitats. Clean and change airstones frequently to prevent reduced circulation from clogging or wearing out Bubble size is related to back pressure. The smaller the bubbles, the more power you will need from your pump. For small bubble, wood, glass, or ceramic airstones used on protein skimmers, select a more powerful pump than is usually rated for your tank size.