u can do the pipe trap or just try to catch some physically which is hard since the hise during light hours....
i would think the main way to control a bristle worm population is to lessen there food source....
do you think you over feed your tank?? if there is too much waste build up then they will multiply like crazy....
since they are snacking on your corals i would first try to catch as many as you can via pipe trap or other methods then lessen your feeding so they dont keep multiplying....
i find some in my tank none more than an inch and i havent ever noticed any corals/polyps hurt by them