I have had 5 protein skimmers over the years. 1 coralife, 2 bubble magus and 2 reef octopus. The one I currently have is is a new reef octopus 110sss. It’s been running for a week. I have never gotten any of the skimmers to work properly. The water level Has been recommended levels for the skimmers. I have also played around with spacers to fine tune the level. I keep making tiny adjustments every day, with 24 hours to let it settle in. I either Flood the cup with sea water, or nothing at all. I cannot produce the foam head on top. The bubbles always break down inside the tube. I’m about to pull it, and go skimmerless. It’s been almost 3 years of spending money, and having one in my sump that doing little to nothing.