A “Protein Skimmer,” also known as a foam fractionator or protein separator, is a device commonly used in marine and reef aquariums to remove organic waste materials and excess proteins from the water. It operates by injecting air or creating fine bubbles in a column of water, which attracts and traps dissolved organic compounds and proteins, forming a frothy foam at the surface. This foam is then collected and removed from the aquarium, effectively removing impurities and helping to maintain water quality and clarity. Protein skimmers are essential components in saltwater aquariums as they play a crucial role in preventing the buildup of harmful substances and maintaining a healthy environment for marine life. They come in various sizes and designs to accommodate different tank sizes and filtration needs, making them a valuable tool for aquarium enthusiasts and professionals.