Help Soft Coral Eating Nudibranch

hello there,
i`ve had a large toad stool leather for a while but two weeks ago i added a button polyps & it must have ad a few nuds within it because since i added the button i`ve removed two one off the glass & one eating my toad stool stalk well thats the question really if its left alone will the toad stool grow the stripe back that the nud eate the damage is around 6mm wide by 30mm long n 2-3mm deep the leather seems to be ok apart from some new odd behaviour like been out during dark hours n having the odd silk but i`ve heard of people really fraggin theses n the leather growing back 100% so will my leather re grow whats been eaten?

well i`ve looked each night since & not seen anymore & there`s been no more damage since those two have been removed but i`m not sure there all removed i`ll keep my eyes open each day & night for a month if nothing then i`ll guess there all gone