When you say the copper is gone does that mean you had copper in the tank with the same rocks?
Looks like it could be a bit too much light but it is not happy polyps are not all out like they should be.
It could be that sometimes something from one of your other corals got stuck to that tip that can kill it as well.
cut that piece off and see if it recovers. if your water is good it should.
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150 Gal system 3'x3' 400W M/H, Bekett skimmer, Dart return,1/4 HP Chiller
180 Gal Drop tank, LED lights, Bubble master 250 skimmer,Hammerhead on a closed loop, Speed wave return.
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