I’m about three weeks in using this skimmer. So far I’m not impressed. I haven’t given up yet but I’m starting to think I might in the end. The skimmer juice has a brown tinge but that’s about all…I have not cleaned the neck once and I don’t feel like I need to. That should tell you all you need to know imo. Honestly when I got this thing it was more for oxygenation and not nutrients. It’s probably the only reason this review isn’t more negative. I will say it’s tiny, SUPER quiet, and well built. Also it produces bubbles. Not micro bubbles in the tank though- at least for me. I wonder if the people that are saying this thing rocks have experience with other skimmers