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
 

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WHAT KIND OF SUBSTRATE ARE YOU RUNNING ON YOUR TANK?

  • Bare bottom

    Votes: 7 17.9%
  • A shallow bed of fine sand

    Votes: 8 20.5%
  • A shallow bed of coarser sand

    Votes: 10 25.6%
  • A deep sand bed

    Votes: 4 10.3%
  • Mixed substrate or varying sand depth

    Votes: 10 25.6%
  • Some other substrate (posted in the comments)

    Votes: 0 0.0%
  • I don’t have a reef tank yet

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