O.K. this has to be a external pump skimmer and it's part of a build for a freind of mine. Since he has never built a tank before I told him I'd give him a hand. The set up will be two 120 gallon tanks piped together one on first floor one in the basement. Part of the 120 G in the basement will be use as a sump and the other half as a display rufugium. I want to find a good skimmer for the set up what do you think we should go with? I have a Berlin xl hanging around do you think this would do it?