SPS's are the small polyp corals that when conditions are ideal typically have the brightest colors of any coral. I would avoid mixing softies and LPS's with SPS's.
Would that be like star polyps and yellow polyps? If so, then I already have mixed with soft corals. I haven't noticed any problems. Is there something I should look for?
You can mix, I do, but it isn't reccomended. Softies and LPS's wage chemical warfare and can cause problems for SPS's. To help avoid problems I run carbon but I will soon be getting rid of all my softies and LPS's for a SPS's only tank.