What do you mean by, when you needed to add water? Are you just refering to evaporation? If so, you need to not add saltwater. The water evaporates, leaving the salt (minus any salt creep) in the water. If you're replenishing evap. water with saltwater your salinity is going to start rising.
Do you have your filter running? Is there any mechanical filtration? If I remember right you had an all-in-one wet dry, right? There should be a pre-filter above your bio-balls. Is that getting dirty yet? It can take a few days for your tank to clear up. I wouldn't worry about it still being cloudy yet.