So I have a female platy named Citrus. She was fine a minute ago, but now she's at the bottom of the tank. She looks dead, like she isn't breathing. I had to push her around with a stick to help motivate it to live. I'm not sure, she is NOT looking good. 2 days ago she had white patches on here tail. And long white stringy poop. She had this at the beginning of this week. I treated her with melafix and some anti-parasite medicine. I also did a salt dip for 1-2 seconds. After that she seemed stunned and was at the bottom, breathing. That was yesterday, and she was fine after that. Today, she was swimming around nicely. But now, she's just at the bottom, not breathing, not moving her fins, and she's not dead because she's not on her side. She momentarily moves her fins and takes a breath, but that's it. I separated her into a hospital tank. She's still the same, except momentarily moving. I keep trying to motivate her with a stick, and so far it's helping. Please, what's wrong with her? I'm just so worried.