Red Sea RSK 300 Internal Protein SkimmerProtein Skimming Reinvented Efficient Quiet Ergonomic Red Sea Recommends for tanks up to: Light Bioload 225 gallons Medium Bioload 150 gallons Heavy Bioload (most common) 75 gallons General Information: Red Sea Reefer Internal Protein Skimmers are designed with the hobbyist needs in mind. From quiet rubber feet, a robust air silencer, and not to mention the FoamView window with built a built in manual neck cleaner, all which are focused towards easier