We're just now adding corals -- we didn't even have them in our 75, and that was set up 2 years ago! We're sticking with mushrooms. Yet another thing about setting up a new SW tank is lighting, and that can be quite a hurdle when it comes to finances! I like SW, but there's a reason we have 1300 or so gallons more of FW systems than SW. Other than the magical benefits of live rock, I'd pick setting up a FW system over SW any day.