Do you feed your fuge? Have fish in it?
Arrow Crabs are known to eat bristle(fire) worms. Decorator crabs, also, tho if you have any reason to ever move either to your main tank, research them first. I've heard that decorators are pretty destructive in their quest to adorn themselves. They will use coral pieces, and not just dead corals. And I am not familiar with the temprament of either crab, personally.
For my bristleworm problem, I bought a Social Long Finned Fairy Wrasse. He did a good job on the population of smaller worms. And he still does follow me around when I clean or move things, because that tends to stir up a few of the little ones hiding in empty hermit shells and whatnot. He snicks them right out of the water as they float. Literally, follows, so that I have to check for his whereabouts before I move.
Does anyone know if the things I have mentioned will bother the pods?