I am 99% positive I saw her ovulate. I was pairing them up, and she had separated herself from the male a few days before. Before that, they were always together. I tried to keep pairing but she wouldn't have any of it, she would just sit on one side of the tank, and him on the other. After I "saw" her ovulate, she began laying inverted etc.. etc...She has been off feed for over a month now, hasn't lost any weight, and is still glowing. Recently, I have seen her doing the perfect coil thing, and like you said, w/ the TAIL in the center.