Selling a Bubble Magus C3.5 Protein Skimmer. It has worked very well for my 40 breeder with a 29 gallon sump. It's a smaller skimmer, so it's more suited for tanks 60 gallons or lower. Small footprint. Video shows it working in freshwater. I no longer have any saltwater tanks, so I couldn't show it in action. Lost the silencer long ago as I ran the airline into a co2 scrubber.