I was either going to do the 180 or the 220. 220 sounds great but will be an sps doninant tank so not sure if the height will hurt par on the corals in the mid to lower sections. Also the 220 I'm sure would be more likely to get a "blow out". Maybe I'm too paranoid. What does everyone not like about the overflows? Can I get water to turn over 10x with there overflow?