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 do you have a powerhead pointing at the sand?  if so, adjust it so it is not stirring the sandbed.  
 my tank was cloudy for about 4 days after i added the rock and began to cycle, it cleared up within a week.
 
 in terms of knowing if your tank is cycling, do you have a test kit?  and a source of ammonia in the tank to get the cycle started.
 
 Why do you have a HOB filter on the tank?  your biological filtration will come primarlily from the live rock.
 
 I cycled mine with a peice of raw shrimp, and added about 4 -5 lbs of live rock in addition to my 25lbs of base rock and i tested the water daily
 
 Cheers
 
 Chris
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