Montipora Skin tissue turning black

I have a colony of RR Tropic Thunder that will turn black in the areas that are the "oldest". No tissue loss or visible health issues.. the stuff seems very happy and grows like a weed soaking up all my alk/calc
 

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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