I did my first flush this weekend and saw something like you described. What I saw was encased a a clear sack, and the red thing inside looked like a stick (no wings). It was bright blood red, not a dark red. I also saw tomato skins and they were a completely different color, almost reddish/black. Could it be anything other than a parasite. I didn't see any kind of "mouth", and it was big enough that I would have. It was about 1 1/2 inches long.