Tought luck Harvey, I had those once on my Monti but ever sinse I treated the colony, I haven't seen any for months. They do like the shaded areas and will comsume your coral to the bone. They're not fast by any means but they do multiply. How I treated the affected colony was I took the piece out the tank and placed it under running water. Be careful to submerge only the affected areas. I then used a tweezer to pick and scrape them off. I did this once for about a minute and placed it back in the tank. The damaged area was about a 1x1" and took about 1.5 month to heal. I have not seen any Nudi's since and that was over 6 months ago.
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