Adding a DIY protein skimmer to my sump system eventually might not be too difficult. My concern is weather or not you think its worth it? Do protein skimmers add a tangible benefit to a tank that is adequately filtered down to 1 micron and HEAVILY bio-filtered as well as relieves 30-40 percent water change weekly. I've already experimented with crushed coral as a biofiltration media to amazing results. I'm just exploring the ways I might benefit from crossing over some of the more advanced husbandry techniques of high end salt and FW planted aquariums.