Things I have learned over the years keeping sps is:
-Keep alk, calcium, magnesium, and salinity as stable as possible
-good indirect random flow
-you need that white light daytime spectrum during the day. AB+ setting on your light is excellent
-try for at least 300 par, lots of sps really color up at 400+ par
-monitor nitrates and phosphates (more important in sps tank)
-keeping trace elements in line helps a lot as well
-two of the best low cost sps frags you can buy to test out your tank for sps is green slimmer, and a Milka Stylophora
Also don’t get caught up with the magic potions that claim better growth, color, or polyp extension. You don’t need it. Do everything above and you’ll be successful