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Ya sps can handle that lighting just make sure what you introduce to the system is acclimated to the lighting so start it low and work it to the top over a few weeks
I forget what its called but most lfs will carry it.. it comes in a quarter sized tube about 9" long in purple packaging most times. Something like rock putty I think. If you ask the sale associate they SHOULD be able to find it for you. Hopefully someone chimes in with the name though lol
You'll need to get calcium alkalinity and magnesium since they all work together so changing one will effect another. Also if you don't have a phosphate test that's good to have but most are very difficult to read at the low levels which even the slightest bit will effect your tank so I would reccomend a Hannah checker for phosphates