I am just tired of the complaints about damsels when people PUT them in the tank to begin with...just take a bit of responsibility here, that's all.
Catch them and trade them in, no big deal, but otherwise I have little sympathy for the problem and even less for the flushing solution. It isn't shocking. Heck, damsels attack SCUBA divers in the wild (and it can hurt!)
So yes, if they are nippy and you are concerned, trade them back to the LFS - find another tank, or put them in a refugium.