I checked on wetwebmedia and found one that looks just like it (towards bottom of the page):
http://www.wetwebmedia.com/wormidfaqs5.htm

I am still on the fence of whether to put them back in or keep them out. It makes it a total of 3. There might be more anyway. It wouldn't have freaked me out as much had they not been so sticky. That seemed weird. I wonder if small worm like this can eat tiny fish like my pygmy gobies?