After giving birth twice, my female red platy's tail fin became narrow (vs. more fan shaped). Then, despite eating well, her belly became impossibly concave and she died. That was many months ago. Now some of her offspring have developed the same problem. One has already died. (Other breeds of fish in the tanks are unaffected. Several red platies unrelated to the original female are fine.) Any ideas as to what this is and what I can do to stop it?
PS: There is no sign of ich or "orange blobs" that some others have posted regarding sick platies.
PS: There is no sign of ich or "orange blobs" that some others have posted regarding sick platies.