What is the common name for the protein-removing device that creates foam to extract organic waste from saltwater tanks?

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Protein skimmers work by injecting fine air bubbles into a reaction chamber where dissolved organic compounds attach to the bubble surfaces and rise into a collection cup. They are considered essential equipment for any serious saltwater (Deals) aquarium because they remove waste before it breaks down into harmful compounds. The dark, foul-smelling liquid collected is affectionately called "skimmate" by reef hobbyists.

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