My tank was extremley cloudy for about a week when I added my sand. The theory goes that the smaller sand particle size helps with surface area for bacteria growth and is actually beneficial. You'll probably get a few bouts of cloudiness. Do you have any power heads moving water at this point? It may sound wrong, it can actually help though, as it'll mix the sand bed (and move the tiny particles lower in the sand).
If your water is really not clearing up, take some polyster stuffing and put in the input of a powerhead.
55g reef, 2x250W 10k MH
+ 2x96W PC
actninc, 10g sump, AquaC Urchin skimmer, 65lbs LR
xenia, mushrooms, wels. open brain, fungia radiata (orange), green eyed zoos
flame angel, mated pair of false perc, 6-line, firefish
20gH electric yellow cichlid