Something munching my SPS

That looks like typical die off to me, unless you are talking about the purple stuff. The coral appears to be bleached. Can we see more of it?
 
Is that a new acro? It is really light, almost white? They can die off in places that receive no light.
 
I agree with Marc and Rick. Looks like a normal die off and as Rick indicated most likely caused by low light in that area. Someitmes it just happens.
 
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