8O I need to know what to do to save Oscar, my male marigold swordtail! I did a water change, and after the water change I noticed that he was not his hyper self. He was sitting on the bottom of the tank, breathing rapidly, with his front fins sticking straight out, almost as if they were stiff and he couldn't "flap" them. His gills also seem a bit more open than normal, too. The three female he is with are doing just fine. He is normally a very energetic fish, so I immediately knew that something was wrong. I separated him from the other fish in hopes of nursing him to health. I checked my thermometer, and everything was fine. I don't know what could have caused it, and I don't know how to fix it! Is he in some sort of shock? Could he have gotten too much oxygen from the new water? I am worried! 
