The Berlin skimmer is not a very good skimmer IMO
. But if you ordered it already you can make it somewhat decent by putting a larger pump then recommend on it, something in the range of 900 gph
. I am switching mine out soon, but I currently have a mag 9.5 running my Berlin. The Berlin requires constant tweeking and its performance is affected dramatically by the water level in your sump it should be submersed at least 9 inches of water to skim anything. I would not recommend this skimmer for a any tank especially a 100+ gallon tank.
good luck! But I would be willing to bet within 6 months you will be buying a new skimmer.