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08-30-2010, 10:57 AM
Generally, no. But before you get your heart rate up, they can and often do die off on their own. However, if you still notice them hanging around in a week or so, then you could probably start being on the defensive. If they ever get up to colony size they can be a pain in the butt, and they pack one heck of a sting. They can, if they get large enough and are of the right strain, eat certain smaller shrimp.
They do require the typical things required of a nuisance pest, very similar to aiptasia actually, namely they need excess nutrients and something to feed on, so you can starve them out in a similar manner. There are livestock options that will eat them, but until you have a full on infestation I would advise against that. Not only are the options not very suitable for most reef tanks, but even the right nudibranch would end up just starving after it took care of them.
Also, the old standby of kalk paste is reported to work well.
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