Most impressive predator I have seen for these is the green coris wrasse. All they do is hunt the zoas for food. I saw a green coris eat about 50 nudi's in less than 5 minutes once - just like a machine. Not a bad looking fish either, and cheap. I have one in my display and one in my frag tank for this very purpose.
Nudi's seem to come in on alot of zoas these days, I see then at many LFS's.
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I'm out. 
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