Condition: 100% Brand New_x000D_ Item Type: Protein Skimmer_x000D_ Material: Acrylic_x000D_ Total Length: Approx. 26.5cm / 10.4in_x000D_ Weight: Approx. 184g / 6.5oz_x000D_ _x000D_ Usage:_x000D_ 1. Partially submerged, partially exposed surface._x000D_ 2. Not for fresh water._x000D_ 3. It must be driven by an air pump. 1It can be used for protein separation to increase dissolved oxygen in water. 2Made of high quality acrylic material, clear view and strong structure, durable in use. 3Practical fish tank accessory, it is designed for 20-30cm fish tank, reliable to use. 4This protein skimmer is mainly used to filter marine water quality, not for fresh water. 5It can separate the organic matter before it decomposes into toxic waste, reducing the burden on the biochemical system.1. Please allow 0-2 cm error due to manual measurement. Thanks for your understanding._x000D_ 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.1 x Protein Skimmer