Ok so i did i pretty large sized water change on my 90 gal salt water tank. I prepared the salt water the night before in a garbage can i bought specifically for this. After syphoning the water out i very slowly over the course of 2-3 hours added the new water. Now i am starting to notice the fish seem to be irretated, not sure if it is caused by the water change or if they have a virus or fungus of some sort...my yellow tang has looked cloudy for about a week so that couldn't have been cause by the water change...water are common health problems with salt water fish besides ich...and how do i get rid of the problems??