man oh man i feel HORRIBLE for all this happenin so darn quick. to be honest, with the list of things you told us in the first post, it pretty much explains the reason right there as to why so many corals died off so quickly. IMO, the tap water is one of, if not the, biggest issue in all of this like many have said. the lighting is def a concern as well, and if the corals already showed signs of not doing too well when you first switched over, then that was the tip-off right there to slow things down.
i wish you the best of luck with all this, and yes with time and patience, all will be well, even though it may not seem it ATM. i have dealt with many coral losses especially over the past month, mainly due to "over-stuffing" my nano tank (which i am finally upgrading), and have learned the hard way to do things slowly and take advice with a grain of salt, mainly because NO TWO REEF TANKS are the same. ever. but we all must follow SOME general rule of thumb to be able to keep coral alive, and that rule is don't do things quickly. i wish you all the best, and hope everythin turns out ok.
