A local store here in Boise Id. began using ozone in the tanks. Before he added ozone the tanks looked dark and average in clarity. Now that he is using it 1-2hrs a day the tanks look fantastic. Enough that I am contemplating buying a unit to keep the water crystal clear. I figure it will allow better light penetration and a healthier tank. I have read the threads on another forum and the opinion was mixed. Most of the SPS users loved using them, however there were a group that felt it could be harmful or dangerous. Anyone using ozone currently? Anyone have any thoughts about this?