the 200 would be fine. JBNY ran the old version on his 250+ display back in 16' and loved it. That was a while back and his system looked great. UR Italy rates the 200 from 100 to 240 gallons i believe, so IMO you'll be fine.What do you think about Akula UKS-200 on a 155 gallon display tank, 150 gallon rubbermaid stock tank, RedSea Reefmat 1200, and a future 40 gallon or so refugium? Mostly soft corals and fish. I hear that if you have a Reefmat and refugium that you don't need as big of a skimmer on the tank.