That should get rid of most of them. I would be a little concerned about the toxins released by the worms damaging the bacteria and other microfauna on your live rock, though. The same goes for dipping in fresh water (and my gut feeling is that the fresh water alone would actually be more damaging than the toxins). After dealing with these a couple times, I treat them as a symptom of water quality issues and work on getting my nutrients under control when I start to see them. Neither FWE nor wrasses have proven to be a great solution by themselves.
My suggestion would be to siphon as much as you can, put a filter sock on the output of your overflow, then dose with double the recommended dose of FWE (I've done this in an SPS tank and saw no deleterious effects other than some temporary polyp retraction and sliming). Take a small powerhead to blast any dead or stunned worms out of crevices and up into the water column where they should eventually be swept into your overflow if you have decent flow. Even if the worms aren't all killed, you should be able to get a lot of them in the filter sock. Run the carbon as recommended, and then try to figure out where your excess nutrients have been coming from that led to the explosion.
