Nudibranks on sea mats polyps

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I have noticed that some of my sea mats polyps contract for now apparent reason since yesterday. On closer inspection the closed heads each had a small yellow/green nudibrank (it has frills so I assume it is) on it.

It looks like the nudi’s are eating the small tentacles of the polyps and leaves behind a “acid burn” mark. The individual polyp seams to be ok in a hour or two after the nuni has left.

1. Do I have to remove them or will the coral manage?

2. How do I remove them?
 
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Have to remove it. make up a solution of RO water that is the same pH, temp and ALk as your tank display, but no salt. Dip the coral for 40 seconds and see the bugs fall off.

Isolate the coral if you can so the pest doesn't spread to other corals, if it hasn't already.

Good Luck
 

Mike

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Just to add, the nudis are usually species specific and don't tend to eat other corals (other zoas maybe, but nothing else.)
 

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