This is quite sudden as she was fine last night. I have a female mickey mouse platy who is upright and breathing, but not swimming. Her head has turned a reddish color and she also has red streaks at the base of her fins. I don't know if it helps at all, but she's always had thick long poop, even when we medicated for it. Please let me know if you have any idea. We've had her for over a year and this is the first problem she's ever had. Thanks.