CAD Lights PLS-50 Elite Nano Pipeless Protein Skimmer For tanks 5 to 60 gallons CAD Lights refined and reimagined every last detail of their original PLS-50 nano skimmer and have released a new "Elite" model. What's the difference? A shorter break-in time, easier to operate controls along with a larger collection cup and bubble plate help make the PLS-50 Elite one of the best nano skimmers money can buy. Did we mention it's almost inaudible while operating? Watch and listen!