I have 2 xr15 g4 pros above my Red Sea Reefer 350, 47" x 20" x 21"h. I have them set to AB+ at 50% intensity. I used that as a starting point 6 months ago and am now wondering if this is an optimal setting for them? I have mostly softie and Euphillia coral in the lower half of the tank but have 2 SPS corals withing about 6" from the water surface. They seem to be doing well. Does anyone have a PAR chart that matches this configuration or any other recommendations for intensity setting?