I recently aquired a 125 gallon established reef tank. It came with 4 fish- large purple tang, flame angel, clown, and royal gamma. my question is this. the guy mentioned that he had problems with ich in the past. fish looked great when i came to pick up the tank and looked great the first week at my home. no signs of stress. then one day i noticed small white specks on the tang and angel. well my first thought was ich. then i started thinking...I had mixed some water to add to raise my water level- not top off- actually mixed salt water because i felt the tank needed a higher level. anyway, the salt that he sent with the tank was not my normal oceanic- rather coralife. I felt that the salt did not mix very well and when i added the water to the sump, i could see lots of (what I thought was) undissolved salt shooting into the tank. the next day the fish had the spots. then a day or 2 later they were gone??? could the salt have stuck to the fish? Reason i am asking is because i recently (like a day ago) did a water change and the same thing happened. weird...I know. none of the other fish have these spots. i will have to check to see if they are still there today- because they showed up last night.