Many people asked me what's the purpose of a protein skimmer?
The purpose of a protein skimmer is to help export the dissolved organics that are in a saltwater aquarium. As the micro bubbles are form inside a protein skimmer the organics that are dissolved in the water column will start to bond with each other and form into organic waste inside a protein skimmer collection cup. A protein skimmer is filter for saltwater aquarium. You cannot use a protein skimmer in freshwater because the micro bubbles would not form unlike in a saltwater aquarium. In essence a protein skimmer is what a mechanical filter is to freshwater aquarium. a device in removing waste from an aquarium.