minireefer is right on. so which one do you have? gee got me, but, at this point if it really bothers you, there are several traps available to trap um. dr. smith, pet warehouse or any other out let will have them. I like the sterle nylon knee sock with clam or squid. small piece inside weighted down to bottom over night and pull out 1st thing in morning. bristle worms get stuck in the nylon so you just pull them out, and some times with the other things that also get stuck that may be nocturnal feeders. hope something here helps. the 14" worm pulled out of my last system was definitely not a wanted item, the others were not a problem.