This morning I noticed that my blue wag platy has her fins clamped together, and she's hunched over. Her overall posture looks deformed and I'm not sure what happened to her. Usually she can be seen swimming around and eating algae off the plants, decor, etc., but she hasn't been moving a whole lot today. She still comes up to the front of the tank when I approach it, but she seems tired and drained. She ate yesterday and she seemed to be acting normal, so I don't understand why she's changed so much in such a sort amount of time.
Some extra information:
- Ammonia is at 0, Nitrites are at 0, and Nitrates are at 25 ppm
- As far as I know, she's the "alpha" of the tank and the other platies don't bully her, so I don't think that's the cause of her issue
- The other fish are active and behaving normally
- I recently medicated the tank with API General Cure for skin and gill flukes on another fish, who made a full recovery