Okay this is kind of a question that deals with freshwater but involves saltwater. I figured this would be the right forum to ask this on because it involves protein skimmers. I've always wondered this so here goes. Would a protein skimmer have a positive effect if you use it on freshwater. Would it still skim out dissolved organics or does it have to be used in saltwater. I've never heard of anybody using a skimmer on freshwater, but I'm curious.