I am in the process of setting up another 125G tank that is going to be a preditor tank along with my 125G reef tank. I currently am using a Red Sea Berlin skimmer on the reef tank in a 20G fug. I am going to convert a 75G glass tank into a refug to handle both tanks and am looking at a new skimmer to handle both tanks. The euros seem to be the favorite and I am needing some advise on the size to get. I am looking at the RS180 or RS250. I know everyone is going to say get the larger, but is that really necessary, it is bigger and the foot print is larger also. I don't plan on a lot of fish in either tank, but the preditors do tend to be messy. Their ratings are somwhat different that what I am used to and that is somewhat confusing. 