Pest Nudibranchs

[turkleton]

I recently discovered some nudibranchs devouring my Xenia. The Xenia is a small, bushy non-pulsing variety, and the nudibranchs are well camouflaged against the coral. I was wondering if anyone has experenced this before, and what can be done to remove or kill the nudibranchs before they completely destroy my Xenia.