I'll chime in and restate that stable alkalinity is key in keeping SPS, even the easier species. This must be tested once a day to a couple times a week and adjusted accordingly to keep at 8-9dkh.
(That's where I keep mine at)
Any new coral added to any new system needs to be light acclimated.
What the coral was use to in someone else's tank is going to be different in your tank.
Always start on the sand bed for a week and observe, then move up a little and observe and so on and so on.....
Keep your big three at:
Calcium: 350 -400
Alk: 7-9 dkh
Magnesium: 1350-1400
And
No3: 5-10pmm
Po4: trace
With at least weekly water testing and adjustment to keep with in those parameters, you should have no problem keeping SPS. ( Including proper lighting, water flow....etc...)