Aluminum and iron.

I do not see any reason for coral deaths based on those values, and I'd look for other reasons. Can you describe the tank in more detail?

You might benefit from a trace element supplement, but if the tank is getting fish foods and some normal water changes, it is likeyl getting enough trace elements to not cause deaths.
 

WHAT PART OF LIVING WITH A REEF TOOK YOU BY SURPRISE?

  • How much space the supplies and equipment take up

    Votes: 9 42.9%
  • Salt creep, spills, and cleanup outside the tank

    Votes: 2 9.5%
  • Planning trips or finding someone to care for the reef

    Votes: 7 33.3%
  • How attached I’d get to individual animals

    Votes: 2 9.5%
  • Making decisions when there’s no clear right answer

    Votes: 4 19.0%
  • How much the reef affects everyday household life

    Votes: 6 28.6%
  • Nothing in particular, I felt well prepared

    Votes: 1 4.8%
  • Other (Post in the comments)

    Votes: 1 4.8%
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