I have to second the nutrient poor comment. I have always fed sparingly and kept a very low fish load to keep the nutrient levels down but I have noticed a huge improvement on colour just since I started over feeding my tank in an attempt to stop my angel from eating my corals.
Coral growth has always been good but lately its been great and the only difference is the amount of food i've been feeding that rotten regal angel
pics of my old 75g with 175w metal halides, notice the green monti at the top of the tank
pics of the same green monti in the new tank before overfeeding...now under 250w metal halides.
here is a pic of the same monti now
Oh and did I mention growth is fantastic
