Well,its a 100% loss of my LPS collection. The only thing left that is alive are my purple deaths. I took a quick pic what is left from about 30 or so colonys.
before.
as of this morning
What it looked like before
and now
The system in question has been running for over 4 years. I have not added any new fish since then. I have not added any coral since sept of last year. All my parameters are in check. I always keep on top of my tank maintenance. ALL my LPS was healthy untill I did my water change with this salt. There is absolutely no question that there is something wrong with this batch of salt. Just check on RC board. There are already people with the same issues as me.