Newbie question about silt

[Fox]

Hi All,

I put my live rock and live sand in last night and obviously there was a lot of silt and it really muddied the water. Just wondering how long that can take to clear up and if I should turn my powerhead off in order to help it settle. It seems that if I leave it on it will just keep circulating the silt and it wont settle.

The other thing I noticed was that after adding the rock and sand my salinity went up quite a bit...I presume I can just add some more unsalted water to level it out...

Thanks in advance!