Ok. So from what I read, you did a water change and the fish died & the corals are unhappy.
You better find out what is the problem with the water (probably too much kH if that's what you added this time) before you compound the problem by doing another big water change and adding to the issue, instead of solving it.
With tapwater, are you using Prime or what to treat for chlorine? Maybe the city added chloramine in the water system.
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If you see it, can take care of it, better get it or put it on hold. Otherwise, it'll be gone & you'll regret it!
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