The hardest part about new sps hobbyist is: Not taking acclimation to lighting seriously, Not know where to put them and keep moving them, Not knowing if there un-happy until it's 2 late, Not having a good sense of how to display them, not having the correct flow, not knowing how to keep chemistry stable, thinking they can handle just one more fish, not knowing how to glue or epoxy sps(loctite super glue gel or loctite expoxy is avail at walmart) - if there on a rock use expoxy, if not on a large rock use super glue..
Thing I wish I was told before adding SPS:
Create an aquascape that is fit for SPS with flat overhangs and minimal rock. Underhangs will provide a good acclimation point for new corals. Buy some controllable pumps, vortechs or tunzes (I know it sucks but they take out all the guess work in the flow department). Figure out how to keep your calcium & alk stable -everything else is secondary and will fall into place (as long as you don't overcrowd with fish)... Study other's tanks on TOTM and realize that the key is 2 physical things - turbulent gentle flow and very high lighting. If these things are adequate you can afford some instability in the chemistry department. Provide bad flow and lighting as well as chemistry then your doomed. Sometimes it's as simple as your tank is not mature enough to handle SPS and it's in mother natures hands. Take your time do it right the first time..