I had an infestation a few months back. I started by sucking them up one by one with a turkey baster each time I saw one on the zoos. They are much easier to spot at night when the lights are out as you can shine an LED flashlight onto them and they will fluoresce (since they take on the zoozanthellae of the zoa that they consume). Anyway, that made a dent in their numbers but I would still see the odd one now and again. I read a list of wrasses that will hunt them and ended up getting a leopard wrasse (they look cool to boot). Since putting the wrasse in I have not seen a single nudibranch. There are other wrasses that will possibly hunt them like the canary wrasse, six line wrasse, green wrasse, melanarus wrasse, etc.
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