My tank is only 3 months old and I went through (still a little actually) a cyano problem. I did the lights off thing and at times only kept the blues on for a few hours. My SPS started turning brown. Once I kept the lights on the regular schedule, they started coming back. That being said, what REALLY helped was I started doing daily dosing of Red Sea Reef Energy and Reef Colors. ALL my coral, within 10 days, started showing the most incredible colors. The greens and blues in particular are very crisp.