WATERPROOF MAGNETIC CONNECTION SYSTEM - Rated for up to 15 mm (0.6") submersible external magnet. EFFECTIVE PROTEIN DIFFUSION - Special large bottom surface, perfect for breeding tanks or for integration into internal filtration. DISCREET DESIGN - Unobtrusive with simple compact profile opaque body to protect internal parts from light to prevent algae. SELF CLEANING - New self-cleaning impeller, specifically optimized for high efficiency skimming. Cleaning Brush Included Sicce Shark Nano Protein Skimmer 300 up to 80 Gallon are modern internal skimmers with a very compact and innovative Shark design for direct integration into marine biotopes. They come from the latest development and knowledge in the field of reefing and are designed for aquariums up to 150 and 300 liters, depending on the load and type of biotope. Their very low energy consumption makes them the most competitive skimmers on the market for this skimming capacity. They are extremely quiet, easy to use and easy to dismount.