The Reef Octopus Octo Regal 150-INT In-Sump Protein Skimmer Space Saver is a high-quality protein skimmer designed specifically for marine aquariums. With its compact size, the Regal 150 Space Saver is perfect for smaller tanks or in-sump applications. The Reef Octopus brand is known for producing reliable and efficient filtration systems, making this skimmer a great choice for maintaining healthy water conditions in your aquarium.