I have a 180 gal display with an additional 60 gal for my sump and refugium. The tank has been set up for 8 years and is lightly stocked with a 3 fish, soft corals, and LPS. I am just coming off a serous algae problem and have decided to upgrade my skimmer to one of the new ATIs. I originally planned on purchasing a 250 but have been told that it may to too large for my system and will end up being less efficient that the 200. I am willing to spend the extra money on the 250, but want to make sure I have the best match for my system. Any thoughts?