Well, I actually saw a spurt of growth when I changed out my actinics to ATI actinics. Within a week I could see growth on all the sps's. I also feed them every night with marine snow and phytos alternately. Every day I add some different trace elements. I actually dont change the water that often, probably once a month actually. The water stays crystal clear thanx to the skimmer and the ozoniser.
The only problem I have is fighting phospates. The tap water here is crap, so I need to use phospate remover additives every time I do a water change. I also plan to get a reactor for this soon!