Mixed reef is difficult least to say sps dominated tank. Every species has it own needs and requirement.
I think placement of LPS is very important in a mixed reef tank. LPS requires moderate flow and lights. SPS usually needs high flow and high lights.
Normally placing LPS on the bottom is prefered, and sps on higher plane is better. high flow rate on the top, and lower flow rate on the bottom.
My 2cents worth.