Sorry some of your corals are stressed. If the polyps are simply white that is fine and they will recover. If there is actual tissue loss that is bigger deal and normally you need to remove the coral, frag the good tissue (like the top of that stylo, dip , mount on new plug and place in a different location.
Of you have cyano bacteria then yes you need to finish that phase of tank and /or irradicate as it and byproducts will just make life miserable for you and tank.
Of you have cyano bacteria then yes you need to finish that phase of tank and /or irradicate as it and byproducts will just make life miserable for you and tank.