Hopefully others can chime in with help. I don't have a clue what is going one with that female fish. I have not seen that type of blotches before. It appears that her behavior is normal?
In the image, the blotches appear darker than the silvery fish. However, earlier I thought I understood the blotches were lighter color (whitish?) In other words, have the blotches changed color? The earlier picture where you added circles around some blotches appeared to have a white circle around the discolored area; however, that is not clearly seen in the most recent picture. I am unsure if the blotching is a concern or not.
Although if it is something bad, whatever it is is likely in the entire tank (that individual fish is not a new introduction, and there have not been other introductions). The fact that as you state the issue is with that single fish, could be a red flag, but I am unsure of what.
What I would do is continue to monitor, and maintain excellent water quality. I would solve the situation with the unusual parameter readings (make sure to test the actual test kit, such as with distilled water) so you now it is working properly. I would expect anythin wrong with water parameters to affect multiple fish (even if not equally), not just the one.
If it gets worse on the individual fish (and does not appears on others), and her behavior changesI would separate her. But if everything seems normal (except the blotching), then I would not separate her. I just don't think she will do ok by herself in a tank, specially if there is no clear treatment to follow.
Good luck!
In the image, the blotches appear darker than the silvery fish. However, earlier I thought I understood the blotches were lighter color (whitish?) In other words, have the blotches changed color? The earlier picture where you added circles around some blotches appeared to have a white circle around the discolored area; however, that is not clearly seen in the most recent picture. I am unsure if the blotching is a concern or not.
Although if it is something bad, whatever it is is likely in the entire tank (that individual fish is not a new introduction, and there have not been other introductions). The fact that as you state the issue is with that single fish, could be a red flag, but I am unsure of what.
What I would do is continue to monitor, and maintain excellent water quality. I would solve the situation with the unusual parameter readings (make sure to test the actual test kit, such as with distilled water) so you now it is working properly. I would expect anythin wrong with water parameters to affect multiple fish (even if not equally), not just the one.
If it gets worse on the individual fish (and does not appears on others), and her behavior changesI would separate her. But if everything seems normal (except the blotching), then I would not separate her. I just don't think she will do ok by herself in a tank, specially if there is no clear treatment to follow.
Good luck!
