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.
 

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WHICH PART OF YOUR SETUP IS HARDEST TO REACH OR REMOVE FOR ROUTINE MAINTENANCE?

  • Glass behind or beside the tank

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