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this is something i would peg up to as out of my control. i have probably lost more fish than most of the people on this forum and can say that sometimes its your fault and sometimes not. a lot of fish die in the ocean by natural process and i think this is an example of that.
you'll have to export whatever is on the rocks out. few ways to do it, just up to you how.
personally, I would just use the rock as is after a short bath since it will be an instant source of ammonia for the cycle.
as far as copper, the API test is pretty cheap and works well. I forget if it...
+1 on letting the tangs beef up a bit. you can toss a uv on there if you see spots. all the yellow and purple tangs I get have hlle, it's a slow recovery. try selcon, ab+ even some of the acropower in their fresh frozen food. wish I would have seen this early I have way too many blue tangs here...