Someone on ReefSanctuary suggested this:
Quote:
I'll just add, if you find more than a few, you may want to treat the tank with Sailfert's Flatworm Exit. This seems to nuke 'em real good. 
My problem was so bad I had to remove all the zo's, do a freshwater dip, then a dip in a mix of Lugol's Iodine and Flatworm exit (2 drops/gal of flatworm exit). This did the trick, a couple more popped up after that, I treated the tank with flatworm exit and bye bye nudis.
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http://www.reefsanctuary.com/forums/....html#post6742