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 CHANGED THE MOST IN A FISH AS IT MATURED IN YOUR REEF?

  • Size or body shape

    Votes: 0 0.0%
  • Color or pattern

    Votes: 3 50.0%
  • Personality or confidence

    Votes: 0 0.0%
  • Aggression or territorial behavior

    Votes: 0 0.0%
  • Feeding habits

    Votes: 0 0.0%
  • Social behavior or bonding

    Votes: 3 50.0%
  • It really hasn’t changed much

    Votes: 0 0.0%
  • Something else (Tell us what I didn't think of)

    Votes: 0 0.0%
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