Concerned for montipora. Any help or direction appreciated

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JAWSIII

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65 DT 15 sump about a little over a year old. Most all of my corals are doing well ( pics attached). Torch, bubble, Duncan , zoas , hammer and GSP all seem fine. I put this monti in about 3 weeks ago at the highest point of my tank because everything said they like high light. I run 2 AI primes at high blue (116%) , UV (80%) for 10 hours and white I have loaded at 40% for 3 hours and the. 20% for 3hours. So I am mostly high blue for most with whites fot 6 hours.

this is the second monti to do the exact same thing. It starts off good and after about two weeks it begins to whiten on edges then loose color. This one has white edges that keep getting wider seemingly everyday.

water parameters are stable and have been these values for a while

calcium 450
Magnesium 1700
DKH. 10.5
PH 8.2
Salinity 1.025
Amonia undectable
Nitrite undectable
Nitrate 15
Phosphate 0.2

any thoughts??

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BRS

PICK the Most Tested & Least Tested Parameters of your Tank (Pick 2)

  • Calcium (most)

    Votes: 47 6.4%
  • Alkalinity (most)

    Votes: 508 69.4%
  • Magnesium (most)

    Votes: 6 0.8%
  • Phosphate (most)

    Votes: 70 9.6%
  • PH (most)

    Votes: 71 9.7%
  • Nitrate (most)

    Votes: 73 10.0%
  • Nitrite (most)

    Votes: 5 0.7%
  • Ammonia (most)

    Votes: 20 2.7%
  • (least) Calcium

    Votes: 10 1.4%
  • (least) Alkalinity

    Votes: 4 0.5%
  • (least) Magnesium

    Votes: 71 9.7%
  • (least) Phosphate

    Votes: 14 1.9%
  • (least) PH

    Votes: 39 5.3%
  • (least) Nitrate

    Votes: 12 1.6%
  • (least) Nitrite

    Votes: 207 28.3%
  • (least) Ammonia

    Votes: 273 37.3%
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