I have 180 gallon reef tank, that has been operating now for about six months. I recdently upgrade from a 150 gallon tank that I had opearting for a few years. In the previous tank I had no issues keeping corals.

The set up that I have is as follows: six T5 54w bulbs..2 white , 2 blue, 2 pink, on for aprox. 10 -11 per day on timers. My lghts are sitting on top of my tank about six inches from my glass. The lights are 48 inches( the tank lenght is 72, but I have my rock set up...

mayheim