Yesterday I noticed one of my tri coloured sharks had a faded patch of scale on his left side and by last night he had some white grainy looking specs on him, his energy level seemed fine.. I figured this could be the early stage of ich , so I added 30 table spoons of api aquarium salt to my 90 gallon tank, this morning the water is cloudy but thankfully it would seem the faded spot is starting to improve and there is no longer any grainy spots on him, should I continue to add salt? Is it too early for a water change? How long should I continue the salt bath?