This is normal, the current cloudiness is probably caused by your sand getting tossed around in the tank.
You may get cloudy again due to the bacterial bloom from you initial cycle, which is normal as well.
Also, a little off topic, but are you using anything to measure the salinity in the tank aside from just measuring 1/2 cup per gallon? If not you should be measuring it with a hydrometer at a minimum or a refractometer. Using the measuring cup method can be very inaccurate over time.