I have been testing my marine water for about 2 months. Tank is new. I did an experiment and tested pure (reverse osmosis) water and pure water with sea salt added (store bought aquarium sea salt water used was also RO). I noticed in the plain pure water the water changed color to a light green but was clear when Ammonia test chemical was added..but in the water + Salt combination the water also changed color to a light green but was cloudy or almost milky when ammonia test chemical was added. Is this normal?