Thanks to the advice of my local reef store, I got new bulbs for my light. I figured I'd had the same bulbs for 2 years. They were still working so why change ? I was told they should be changed every year. What a difference ! My corals are beautiful, not dull & dingy like they once were. The greens, the blues all show up ! I expected my tank to progress much more quickly than it has. I was getting disappointed. Now maybe my coral will spread much faster. THERE IS HOPE !