All nudibranchs are food specific. That is, whatever they eat, that's all they eat. I agree this appears to be an aeolid species which is not going to be friendly to some coral, perhaps zoanthids.
IF you can freshwater dip the coral then you'll have more luck getting rid of them. You may need multiple dips over a few days as the eggs aren't killed until they hatch and this can take a few days.
If it is zoas they are eating then turn your blues on a few hours after they have gone off. The nudi's will be out munching and tend to glow from the pigment they eat from the zoas making their cirri bright.
Another good thing if you want a natural predator and have the space is one of the smaller halichoeres wrasse.
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