I had almost the same thing happen too me, :( I had went out to town with my tank under the care of my mother and when I came back all my fisk were dead but a few, my blue tang, yellow tang, foxface, lion fish, Pj, saddle back clown, and my water was white too, I ran extra Oxegen to get rid of white over night it was gone, my coral's only lost a part of there color there not as bright as they were but no coral died, and a lot of un wanted algea with hair algea too, so am just getting back on hand and taking care of it now, the only fish that lived throw the die off were my dragon wrasse and my 4 percula clown fish, all my fish were put in another tank as soon as I got home, so I could get them out of the stress they had been throw, I have been real depressed about this I never plan to do this same mistake again I will get old Jim D to watch it next time,lol,