BRISTTLE WORMS ARE GOOD!!! arrow's eat bristtles and fires, bristle worms are a safe species of fireworms, only some eat corals, you dont have to worry about them, if you have worms that look like bristles, btut ehy are a different color, like blue/orange/green then you should try and pick those out, its not a good idea to use natural preditors to get rid of things, they will eventualy run out of food.