Not more than 5 minutes ago, my Kole Tang was swimming around, pecking at rocks, acting completely normal, and the next second there was a little splash and he turned white and was on it's side. Now he is barley alive swimming behind a rock. No other fish was around him, and the weird thing is, that the same thing happened to my trigger last week, who died. They are doing fine, and then at a blink of an eye, they are on their death bed. HELP!!