What do reefers test?

I run calcium reactors on the displays and I check these weekly:
Alk
pH
Salinity

I've been having some color issues in the frag tank which has no calcium reactor and have started checking Ca and Mg as well.
 

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

  • Yes!

    Votes: 32 45.7%
  • Not yet, but I have one that I want to buy in mind!

    Votes: 9 12.9%
  • No.

    Votes: 26 37.1%
  • Other (please explain).

    Votes: 3 4.3%

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