Having good luck so far with my new Panda...but a major incident today with my female swordtail. 1)Noticed today the Zoro, her mate, was bugging her a lot, trying to 'kiss' her constantly, is what it looked like! 2)Suddenly this evening I noticed her at the bottom of the tank, trying to get behind a rock and away from him. Her fins had a yellow tint to them and her gills looked silver. He was relentlessly poking at her. 3)I quickly scooped her out into my Q tank, after changing half of its water out and treating it with Prime. Turned off the main aquarium lights to help relax my other fish in case I disturbed them when removing her. 4)Tested my main tank's water:ammonia 0, nitrite 0, nitrate pretty much 0. Everyone else seems happy and fine. 5)Upon observing her in the Q tank, seems like she's balancing on her tail, with her nose straight up, not moving much otherwise. Recently she must have given birth because there is a baby swordtail in my tank, don't know if there were others though, may have happened at night and they were eaten. Is she at the end of her lifespan, do many fish die after spawning? She is such a beauty but I think I am losing her. Suggestions? Thoughts?