A diatom filter is a very small micron filter that can literally strip a tank of nutrient and free floating organisms. Not something I would suggest using for a SW
tank. It may come in handy to run as a once monthly "polishing" filter but not something to use frequently.
As far as the tank being cloudy, don't sweat it. The particles will soon settle once they become weighted down from bacteria and waste. They are actually a good addition overall and I wouldn't suggest filtering them out.