you should always only top off with fresh water only because salt does not evaporate, your salt levels will slowly raise every time you add water, but as far as your cloudy water you prob should have tested your water before the water change so we had an idea on what was going on, after the water change though it may take a day or two to settle, I would still have all of your water perimeters tested tomorrow to make sure every thing is good.. I also personally do not trust water from any lfs
, it will be worth your time to invest in your own ro
unit.. it will save money in 6 months and your water will be a lot better off. you can also add some carbon, it will help reduce ammonia and it makes the water clear..