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Sorry your having issues with your corals, I believe thats a Goniopora but really hard to tell anything with the pictures provided, try turning up the whites and see if you can get a closer more in focus shot.. to get any practical advice about your coral you should include your complete water parameters and information about your system such as age, lighting (type, intensity, schedule), filtration and any other inhabitants.. full tank pictures are also very useful.
I would try dipping it in something like coral RX and carefully blow it off with a turkey baster during the process. may be some kind of infection or bacterial issue.