What size is your tank? How far are your lights from the upper most coral in your tank/Or water surface? If you have a PAR meter that will help as well to understand just how much light intensity your corals are getting. To give you an example my 120 Gallon display 48x24x24 my Radion Pros running Wide Angle Lenses are 9" off the water surface. While Running at 50% intensity and low nutrients, I'm getting anywhere from 350-450 PAR. My PO4 runs between 0.02-0.05ppm and have not tested for NO3 in quite some time. As for some of the other parameters, I run my DKH 6.9-7.1 and Calcium 430. At one point I was running my Radions at 69% and I was battling Brown plaque algae. After turning my lights down to 45%, I was able to address my algae issue and it has all but completely gone away.