The Tunze DOC Skimmer 9004 is a compact and efficient protein skimmer designed to maintain pristine water quality in small saltwater aquariums. By utilizing the high-performance Venturi principle, this device effectively removes dissolved organic compounds before they break down into harmful nutrients like nitrates and phosphates. Its immersion design allows it to be placed directly within the sump or display tank, making it an ideal filtration solution for setups with limited space where traditional external skimmers cannot fit.

This unit features a precise air output of approximately 150 liters per hour while consuming only 4 watts of power, ensuring quiet and energy-efficient operation. The skimmer is designed to operate at an immersion depth between 225mm and 245mm and includes a collection cup with a volume of 0.2 liters for convenient waste removal. It comes equipped with a powerful magnet holder that securely attaches the unit to glass panes up to 12mm thick, offering flexible placement options without the need for additional clamps or suction cups.

The DOC Skimmer 9004 is best suited for hobbyists managing nano reefs or small aquariums ranging from 60 to 250 liters. It provides a reliable and low-maintenance filtration method for those who want to avoid complex plumbing or large equipment footprints. Whether you are keeping sensitive coral species or maintaining a clean fish-only system, this skimmer delivers the essential biological stability needed to support a thriving marine environment in compact spaces.