Euphyllia side polyps turning dark

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Hello, I noticed that two of my Euphyllias have this darkening of the side polyps. Looks like they’re getting black and dying off. Otherwise, the corals are fully inflated and happy. What could that be and is it normal?



IMG_0014.jpeg

IMG_0013.jpeg
 
Aquarium Specialty - dry goods & marine livestock
Are they being stung by near by corals?
Is the chemistry within normal limits, Sg, alk?
What lighting fixture and intensity?
 

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