I've never heard of anything available to us that eats them (edit: spoke too soon). Although there are probably species of nudibranch that do... I say that because there seems to be a nudibranch for everything. What I have heard of people doing is burning them off of the rock with a torch. A small butane torch should work but in one instance a friend of mine used a large propane tiger torch to burn them off of +200lbs of his live rock.
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