Lynski, here's another recommendation, you may not like it though. Get rid of that skimmer. I had a berlin turbo classic, and the thing would never maintain its settings and achieve good skimming. I gave up on it, after about a year, and replaced it with a AquaC-ev120. After the initial break in, when it generated lots of heavy, wet, almost clear foam (about 2 weeks of that), it settled down and produces a nice brown/green skim. During those two weeks, I did have to add water constantly, however, it was akin to doing the required water changes, just easier in a way. I've heard good things about the Pm bullet 1's as well, not tried one, think they're basically the same operating technique. This also depeneds on tank size, and how much money your willing to spend on it (they're NOT cheap!).