I found an unidentified worm crawling around my tank tonight which I have never seen before. I removed it out of fear of the unknown, still in a cup. It is about 1.25" long, 1/8" wide, pretty flat body, light grey, segmented and can swim. It has "hairs" on the edge of its body that wave back in further to swim. Pretty darn quick too. I know its not a bristle worm but I can try again tomorrow if needed. The pics I took are pretty poor. Any ideas on what it is?