What's this on my acropora?

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gordoncheers

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IMG_5531.jpeg
 
Saltwater Aquarium
Hard to tell from the pic. I'll bump this up though in case someone else can help
 
Was able to capture this picture during my water change. There seems to be some brown parts on the coral. Does anyone know what may be the cause of this?
IMG_5543.jpeg
 
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