Unraveling the Mystery

My thread on Aquamaniacs.net has started to yield some answers. I was led to this website which has let me to believe I captured a Gordian, or horsehair worm. The description matched what I have, from the tapered, indistinguishable ends, to the thin, coiled/knotted body positions.

Fortunately, it is not dangerous to me or pepper. At first, I thought it harmless to my fish and shrimp for that matter. According to this website, however, it preys on invertebrates as well as insects. In fact, thinking back, I remember seeing a white, squiggly mass in one of the ghost shrimp I bought, but at the time, I blamed that oddity on something he ate. Since mine was the adult form, he probably was harmless, but on the off chance that he managed to spawn, I put him down the sink anyway.