So I am looking for some guidance before it happens. This week I will be filling my tank (with water I mixed not NSW) with a used sand bed that has been washed and dead rock. Should I expect my skimmer to be working or will it take a while to start skimming. I tested the skimmer a couple of weeks ago in a bucket with NSW so I know it works well. But with non sea water (DI water mixed with salt) will it skim since the water is so clean?