Freshwater dip for about 2-3 minutes will do the trick. Don't leave the coral in the FW much longer or you will risk over-stressing/killing it. At a minimum, make sure the FW is the same temperature as your SW.
Remember to give the coral a good shake just before you pull it out of the FW. Oh, and as you are probably aware, the FW dip will kill all inverts that happen to be living on the rock, bad and good.
If you see any eggs on the zoanthids, make sure you remove them manually with tweezers.
Depending on how resilient the zoanthid is it may take one day to a week for them to open up again.
Good luck.
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