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What new corals or macro algae have you introduced to your tank?
Yes to nudibranchs, type I do not know.

Hmm well they do not look like your typical zoanthid eating nudibranchs, but they came in on something.
Nudibranchs have very specific diets, they usually only eat one type of coral, sponge, gorgonian or macro algae...Once that is gone they starve and die.
Typically they look like what they eat. Keep an eye out and see if they are gathering in one spot.

