I should probably qualify my timeframe statement a little. There are a few exceptions. My tank has been up for years. At one point I went through a pretty bad crash and from frustration ran Fish only with live rock for a couple years. My halide bulbs were just as old. There were two corals that lived through the crash that were not growing and brown. They were probably the size of a baseball. When I finally got over the grief of losing all my coral I started putting LED's in the tank. (about 8 months ago) A friend and fellow reefer was tearing down his tank and gave me a few small baseball size corals to move to mine. I continued to add LED's and frags to the tank. Fast forward to today.