Montipora eating nudibranch, one of the most annoying pest in the hobby, sorry bud.
From what I know, most people end up making frags of their monti's, and QTing them for a couple months, leaving the display free of any montipora so the nudi's can starve. They generally target caps first, but can even move on to digi, and setosa as well. In the QT, I think you should be dipping the frags once a week/inspect to make sure there's no eggs/nudi's on them.
If you see a couple, that means they've been laying eggs, and dips will only knock off/stun the adults, but the eggs are the important part.
Good luck!
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