A protein skimmer is a device used in aquariums, particularly saltwater tanks, to remove organic waste. It works by creating bubbles that attract and trap proteins and other impurities from the water. As the bubbles rise, they carry the waste to a collection cup, where it can be easily removed. This process helps maintain water quality by reducing harmful substances, which can lead to algae growth and affect the health of aquatic life. Regular use of a protein skimmer can contribute to a cleaner and healthier environment for fish and other organisms in the aquarium, such as coral and invertebrates.