I have noticed a huge change is some of my zoas with a change in location in the tank. They where about 6 inches from a 50/50 96w pc, and are now about 12 inches from a 400w 10k bulb. They went from run of the mill looking to what closly resembles PPE's. A HUGE and pleasing change. What are you zoa crazy peeps keeping your under for best coloration and growth.