It's not the fan worms i would be worried about killing, it's the beneficial bacteria that make your live rock worth $5 - 7 or more a LB. Your LR will lose this bacteria and it won't be filtering your tank anymore....plus you're going to have a big ammonia spike from the die off....if you FW dip your rocks are you going to FW dip the sand as well? There are "bugs" in there too! No, FW dipping the rock isn't the answer....what do the bugs look like? Was it actually feeding off of your fish? Did it come off in the FW dip you gave your fish?
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