Typically algae causing cloudiness is more of a yellow or green tinge to the water, and to be honest I can't say I've ever seen this in a Saltwater tank. I would double check you water parameters also if you don't test for Ca try that too as when Calcium gets to saturation in the water it will precipitate out of solution and cause a cloudiness. Although if your not adding a Ca supplement to the aquarium I wouldn't imagine that the Cacium would be at that point. Either way good idea to do a full line of testing and post your results.
Thanks
Myk.