What causes this to happen to the coral

Buck commander

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Its happening on a few peices I have. Rtn ?

20200808_161825.jpg 20200808_161934.jpg
 

MnFish1

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Could be stinging - from something nearby - could be damage from 'touching/shipping' - could be a disease?
 

Spieg

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RTN typically exposes the skeleton (usually white or blue or pink), yours looks black. I would guess that is damage from a parasite or infection.
 
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